525129986 has 4 divisors (see below), whose sum is σ = 787694982. Its totient is φ = 262564992.

The previous prime is 525129977. The next prime is 525130019. The reversal of 525129986 is 689921525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 525097225 + 32761 = 22915^2 + 181^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 525129986.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131282495 + ... + 131282498.

Almost surely, 2^525129986 is an apocalyptic number.

525129986 is a deficient number, since it is larger than the sum of its proper divisors (262564996).

525129986 is a wasteful number, since it uses less digits than its factorization.

525129986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262564995.

The product of its digits is 388800, while the sum is 47.

The square root of 525129986 is about 22915.7148262933. The cubic root of 525129986 is about 806.7808962916.

The spelling of 525129986 in words is "five hundred twenty-five million, one hundred twenty-nine thousand, nine hundred eighty-six".