56550921 has 16 divisors (see below), whose sum is σ = 86559744. Its totient is φ = 32169744.

The previous prime is 56550919. The next prime is 56550961. The reversal of 56550921 is 12905565.

It is not a de Polignac number, because 56550921 - 2¹ = 56550919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56550961) 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, 1165 + ... + 10698.

It is an arithmetic number, because the mean of its divisors is an integer number (5409984).

Almost surely, 2^56550921 is an apocalyptic number.

It is an amenable number.

56550921 is a deficient number, since it is larger than the sum of its proper divisors (30008823).

56550921 is a wasteful number, since it uses less digits than its factorization.

56550921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12100.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 56550921 is about 7520.0346408777. The cubic root of 56550921 is about 383.8367565135.

The spelling of 56550921 in words is "fifty-six million, five hundred fifty thousand, nine hundred twenty-one".