551501631 has 12 divisors (see below), whose sum is σ = 796939000. Its totient is φ = 367517520.

The previous prime is 551501609. The next prime is 551501651. The reversal of 551501631 is 136105155.

551501631 is a `hidden beast` number, since 551 + 50 + 1 + 63 + 1 = 666.

It is not a de Polignac number, because 551501631 - 2²⁶ = 484392767 is a prime.

It is a super-2 number, since 2×551501631² = 608308097991320322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551501595 and 551501604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551501651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13596 + ... + 35886.

Almost surely, 2^551501631 is an apocalyptic number.

551501631 is a deficient number, since it is larger than the sum of its proper divisors (245437369).

551501631 is a wasteful number, since it uses less digits than its factorization.

551501631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25046 (or 25043 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 551501631 is about 23484.0718573249. The cubic root of 551501631 is about 820.0662404351.

Adding to 551501631 its reverse (136105155), we get a palindrome (687606786).

The spelling of 551501631 in words is "five hundred fifty-one million, five hundred one thousand, six hundred thirty-one".