56561615 has 8 divisors (see below), whose sum is σ = 74044368. Its totient is φ = 41135680.

The previous prime is 56561563. The next prime is 56561621. The reversal of 56561615 is 51616565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56561615 - 2¹⁶ = 56496079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514142 + ... + 514251.

It is an arithmetic number, because the mean of its divisors is an integer number (9255546).

Almost surely, 2^56561615 is an apocalyptic number.

56561615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56561615 is a deficient number, since it is larger than the sum of its proper divisors (17482753).

56561615 is a wasteful number, since it uses less digits than its factorization.

56561615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028409.

The product of its digits is 27000, while the sum is 35.

The square root of 56561615 is about 7520.7456412247. The cubic root of 56561615 is about 383.8609499984.

The spelling of 56561615 in words is "fifty-six million, five hundred sixty-one thousand, six hundred fifteen".