1231161330 has 32 divisors (see below), whose sum is σ = 3376900224. Its totient is φ = 281408256.

The previous prime is 1231161313. The next prime is 1231161341. The reversal of 1231161330 is 331611321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1231161297 and 1231161306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2931127 + ... + 2931546.

It is an arithmetic number, because the mean of its divisors is an integer number (105528132).

Almost surely, 2^1231161330 is an apocalyptic number.

1231161330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231161330 is an abundant number, since it is smaller than the sum of its proper divisors (2145738894).

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

1231161330 is a wasteful number, since it uses less digits than its factorization.

1231161330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862690.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1231161330 is about 35087.9086011122. The cubic root of 1231161330 is about 1071.7783714483.

Adding to 1231161330 its reverse (331611321), we get a palindrome (1562772651).

The spelling of 1231161330 in words is "one billion, two hundred thirty-one million, one hundred sixty-one thousand, three hundred thirty".