129506536 has 16 divisors (see below), whose sum is σ = 248747940. Its totient is φ = 63173760.

The previous prime is 129506519. The next prime is 129506551. The reversal of 129506536 is 635605921.

It can be written as a sum of positive squares in 2 ways, for example, as 109202500 + 20304036 = 10450^2 + 4506^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129506495 and 129506504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197091 + ... + 197746.

Almost surely, 2^129506536 is an apocalyptic number.

It is an amenable number.

129506536 is a deficient number, since it is larger than the sum of its proper divisors (119241404).

129506536 is a wasteful number, since it uses less digits than its factorization.

129506536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394884 (or 394880 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 129506536 is about 11380.0938484707. The cubic root of 129506536 is about 505.9379177792.

The spelling of 129506536 in words is "one hundred twenty-nine million, five hundred six thousand, five hundred thirty-six".