556691901 has 32 divisors (see below), whose sum is σ = 770238720. Its totient is φ = 357504000.

The previous prime is 556691897. The next prime is 556691903. The reversal of 556691901 is 109196655.

It is not a de Polignac number, because 556691901 - 2² = 556691897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556691903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2430855 + ... + 2431083.

It is an arithmetic number, because the mean of its divisors is an integer number (24069960).

Almost surely, 2^556691901 is an apocalyptic number.

It is an amenable number.

556691901 is a deficient number, since it is larger than the sum of its proper divisors (213546819).

556691901 is a wasteful number, since it uses less digits than its factorization.

556691901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 556691901 is about 23594.3192527354. The cubic root of 556691901 is about 822.6308034996.

The spelling of 556691901 in words is "five hundred fifty-six million, six hundred ninety-one thousand, nine hundred one".