56503281 has 16 divisors (see below), whose sum is σ = 78422400. Its totient is φ = 36142848.

The previous prime is 56503273. The next prime is 56503303. The reversal of 56503281 is 18230565.

It is not a de Polignac number, because 56503281 - 2³ = 56503273 is a prime.

It is a super-2 number, since 2×56503281² = 6385241527529922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56503261) 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, 12585 + ... + 16473.

It is an arithmetic number, because the mean of its divisors is an integer number (4901400).

Almost surely, 2^56503281 is an apocalyptic number.

It is an amenable number.

56503281 is a deficient number, since it is larger than the sum of its proper divisors (21919119).

56503281 is a wasteful number, since it uses less digits than its factorization.

56503281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 56503281 is about 7516.8664348916. The cubic root of 56503281 is about 383.7289414680.

The spelling of 56503281 in words is "fifty-six million, five hundred three thousand, two hundred eighty-one".