961511556 has 24 divisors (see below), whose sum is σ = 2249023840. Its totient is φ = 319718592.

The previous prime is 961511533. The next prime is 961511557. The reversal of 961511556 is 655115169.

It is a super-2 number, since 2×961511556² = 1849008944643082272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (961511557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93046 + ... + 102861.

Almost surely, 2^961511556 is an apocalyptic number.

It is an amenable number.

961511556 is an abundant number, since it is smaller than the sum of its proper divisors (1287512284).

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

961511556 is a wasteful number, since it uses less digits than its factorization.

961511556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196323 (or 196321 counting only the distinct ones).

The product of its digits is 40500, while the sum is 39.

The square root of 961511556 is about 31008.2498054953. The cubic root of 961511556 is about 987.0023106820.

The spelling of 961511556 in words is "nine hundred sixty-one million, five hundred eleven thousand, five hundred fifty-six".