56636551 has 6 divisors (see below), whose sum is σ = 57869480. Its totient is φ = 55429356.

The previous prime is 56636543. The next prime is 56636563. The reversal of 56636551 is 15563665.

It is a happy number.

It is not a de Polignac number, because 56636551 - 2³ = 56636543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56636551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56636501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10611 + ... + 15028.

Almost surely, 2^56636551 is an apocalyptic number.

56636551 is a deficient number, since it is larger than the sum of its proper divisors (1232929).

56636551 is an equidigital number, since it uses as much as digits as its factorization.

56636551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25733 (or 25686 counting only the distinct ones).

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

The square root of 56636551 is about 7525.7259450501. The cubic root of 56636551 is about 384.0303953624.

The spelling of 56636551 in words is "fifty-six million, six hundred thirty-six thousand, five hundred fifty-one".