1310231220 has 48 divisors (see below), whose sum is σ = 3746711808. Its totient is φ = 341960320.

The previous prime is 1310231201. The next prime is 1310231239. The reversal of 1310231220 is 221320131.

It is an interprime number because it is at equal distance from previous prime (1310231201) and next prime (1310231239).

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 1310231220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229491 + ... + 235130.

It is an arithmetic number, because the mean of its divisors is an integer number (78056496).

Almost surely, 2^1310231220 is an apocalyptic number.

1310231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1310231220 is an abundant number, since it is smaller than the sum of its proper divisors (2436480588).

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

1310231220 is a wasteful number, since it uses less digits than its factorization.

1310231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464680 (or 464678 counting only the distinct ones).

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

The square root of 1310231220 is about 36197.1161834752. The cubic root of 1310231220 is about 1094.2485534711.

Adding to 1310231220 its reverse (221320131), we get a palindrome (1531551351).

The spelling of 1310231220 in words is "one billion, three hundred ten million, two hundred thirty-one thousand, two hundred twenty".