1313231556 has 72 divisors (see below), whose sum is σ = 3838699200. Its totient is φ = 346344768.

The previous prime is 1313231539. The next prime is 1313231573. The reversal of 1313231556 is 6551323131.

It is an interprime number because it is at equal distance from previous prime (1313231539) and next prime (1313231573).

It is a super-2 number, since 2×1313231556² = 3449154239348362272, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 78256 + ... + 93543.

Almost surely, 2^1313231556 is an apocalyptic number.

It is an amenable number.

1313231556 is an abundant number, since it is smaller than the sum of its proper divisors (2525467644).

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

1313231556 is a wasteful number, since it uses less digits than its factorization.

1313231556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171833 (or 171824 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 1313231556 is about 36238.5368909949. The cubic root of 1313231556 is about 1095.0831670949.

Adding to 1313231556 its reverse (6551323131), we get a palindrome (7864554687).

The spelling of 1313231556 in words is "one billion, three hundred thirteen million, two hundred thirty-one thousand, five hundred fifty-six".