551011636 has 12 divisors (see below), whose sum is σ = 1102023328. Its totient is φ = 236147832.

The previous prime is 551011631. The next prime is 551011651. The reversal of 551011636 is 636110155.

551011636 is an admirable number.

It is a super-2 number, since 2×551011636² = 607227646014792992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 19678987 = 551011636 / (5 + 5 + 1 + 0 + 1 + 1 + 6 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551011631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9839466 + ... + 9839521.

Almost surely, 2^551011636 is an apocalyptic number.

It is an amenable number.

551011636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551011636 is a wasteful number, since it uses less digits than its factorization.

551011636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19678998 (or 19678996 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 551011636 is about 23473.6370424355. The cubic root of 551011636 is about 819.8232992249.

The spelling of 551011636 in words is "five hundred fifty-one million, eleven thousand, six hundred thirty-six".