56903281 has 8 divisors (see below), whose sum is σ = 57823304. Its totient is φ = 55987200.

The previous prime is 56903263. The next prime is 56903303. The reversal of 56903281 is 18230965.

It can be written as a sum of positive squares in 4 ways, for example, as 39187600 + 17715681 = 6260^2 + 4209^2 .

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

It is a 7-Lehmer number, since φ(56903281) divides (56903281-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 56903281 - 2⁷ = 56903153 is a prime.

It is a super-2 number, since 2×56903281² = 6475966777129922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56903251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43225 + ... + 44521.

It is an arithmetic number, because the mean of its divisors is an integer number (7227913).

Almost surely, 2^56903281 is an apocalyptic number.

It is an amenable number.

56903281 is a deficient number, since it is larger than the sum of its proper divisors (920023).

56903281 is a wasteful number, since it uses less digits than its factorization.

56903281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 56903281 is about 7543.4263435126. The cubic root of 56903281 is about 384.6323155183.

The spelling of 56903281 in words is "fifty-six million, nine hundred three thousand, two hundred eighty-one".