129185956 has 9 divisors (see below), whose sum is σ = 226115211. Its totient is φ = 64581612.

The previous prime is 129185951. The next prime is 129185977. The reversal of 129185956 is 659581921.

The square root of 129185956 is 11366.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×129185956² = 33378022455267872, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129185951) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 19891 + ... + 25573.

Almost surely, 2^129185956 is an apocalyptic number.

129185956 is the 11366-th square number.

It is an amenable number.

129185956 is a deficient number, since it is larger than the sum of its proper divisors (96929255).

129185956 is an frugal number, since it uses more digits than its factorization.

129185956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370 (or 5685 counting only the distinct ones).

The product of its digits is 194400, while the sum is 46.

The cubic root of 129185956 is about 505.5201072239.

The spelling of 129185956 in words is "one hundred twenty-nine million, one hundred eighty-five thousand, nine hundred fifty-six".