505631656 has 8 divisors (see below), whose sum is σ = 948059370. Its totient is φ = 252815824.

The previous prime is 505631627. The next prime is 505631657. The reversal of 505631656 is 656136505.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 442429156 + 63202500 = 21034^2 + 7950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (505631657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31601971 + ... + 31601986.

Almost surely, 2^505631656 is an apocalyptic number.

It is an amenable number.

505631656 is a deficient number, since it is larger than the sum of its proper divisors (442427714).

505631656 is a wasteful number, since it uses less digits than its factorization.

505631656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63203963 (or 63203959 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 505631656 is about 22486.2548237807. The cubic root of 505631656 is about 796.6693065121.

The spelling of 505631656 in words is "five hundred five million, six hundred thirty-one thousand, six hundred fifty-six".