56551605 has 32 divisors (see below), whose sum is σ = 104519808. Its totient is φ = 25804800.

The previous prime is 56551589. The next prime is 56551613. The reversal of 56551605 is 50615565.

It is not a de Polignac number, because 56551605 - 2⁴ = 56551589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7276 + ... + 12885.

It is an arithmetic number, because the mean of its divisors is an integer number (3266244).

Almost surely, 2^56551605 is an apocalyptic number.

56551605 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56551605 is a deficient number, since it is larger than the sum of its proper divisors (47968203).

56551605 is a wasteful number, since it uses less digits than its factorization.

56551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20197.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 56551605 is about 7520.0801192540. The cubic root of 56551605 is about 383.8383040467.

It can be divided in two parts, 5655 and 1605, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 56551605 in words is "fifty-six million, five hundred fifty-one thousand, six hundred five".