56551551 has 16 divisors (see below), whose sum is σ = 87462144. Its totient is φ = 31832064.

The previous prime is 56551529. The next prime is 56551553. The reversal of 56551551 is 15515565.

It is not a de Polignac number, because 56551551 - 2⁵ = 56551519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56551553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18690 + ... + 21503.

It is an arithmetic number, because the mean of its divisors is an integer number (5466384).

Almost surely, 2^56551551 is an apocalyptic number.

56551551 is a deficient number, since it is larger than the sum of its proper divisors (30910593).

56551551 is a wasteful number, since it uses less digits than its factorization.

56551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40270.

The product of its digits is 18750, while the sum is 33.

The square root of 56551551 is about 7520.0765288659. The cubic root of 56551551 is about 383.8381818735.

It can be divided in two parts, 5 and 6551551, that added together give a palindrome (6551556).

The spelling of 56551551 in words is "fifty-six million, five hundred fifty-one thousand, five hundred fifty-one".