56401555 has 32 divisors (see below), whose sum is σ = 80547840. Its totient is φ = 37100160.

The previous prime is 56401537. The next prime is 56401559. The reversal of 56401555 is 55510465.

It is not a de Polignac number, because 56401555 - 2¹⁹ = 55877267 is a prime.

It is a super-2 number, since 2×56401555² = 6362270812836050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (56401559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246181 + ... + 246409.

It is an arithmetic number, because the mean of its divisors is an integer number (2517120).

Almost surely, 2^56401555 is an apocalyptic number.

56401555 is a deficient number, since it is larger than the sum of its proper divisors (24146285).

56401555 is a wasteful number, since it uses less digits than its factorization.

56401555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 56401555 is about 7510.0968702141. The cubic root of 56401555 is about 383.4985202794.

The spelling of 56401555 in words is "fifty-six million, four hundred one thousand, five hundred fifty-five".