1231102320 has 80 divisors (see below), whose sum is σ = 4361625600. Its totient is φ = 281394432.

The previous prime is 1231102309. The next prime is 1231102331. The reversal of 1231102320 is 232011321.

It is an interprime number because it is at equal distance from previous prime (1231102309) and next prime (1231102331).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1231102320² = 3031225844618764800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231102320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364720 + ... + 368079.

It is an arithmetic number, because the mean of its divisors is an integer number (54520320).

Almost surely, 2^1231102320 is an apocalyptic number.

1231102320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231102320 is an abundant number, since it is smaller than the sum of its proper divisors (3130523280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231102320 is a wasteful number, since it uses less digits than its factorization.

1231102320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732822 (or 732816 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231102320 is about 35087.0677030726. The cubic root of 1231102320 is about 1071.7612476020.

Adding to 1231102320 its reverse (232011321), we get a palindrome (1463113641).

Subtracting from 1231102320 its reverse (232011321), we obtain a palindrome (999090999).

The spelling of 1231102320 in words is "one billion, two hundred thirty-one million, one hundred two thousand, three hundred twenty".