57292281 has 6 divisors (see below), whose sum is σ = 82755530. Its totient is φ = 38194848.

The previous prime is 57292273. The next prime is 57292289. The reversal of 57292281 is 18229275.

57292281 is a `hidden beast` number, since 572 + 9 + 2 + 2 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (57292273) and next prime (57292289).

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 2295225 = 7416^2 + 1515^2 .

It is not a de Polignac number, because 57292281 - 2³ = 57292273 is a prime.

It is a super-2 number, since 2×57292281² = 6564810924365922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57292289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3182896 + ... + 3182913.

Almost surely, 2^57292281 is an apocalyptic number.

It is an amenable number.

57292281 is a deficient number, since it is larger than the sum of its proper divisors (25463249).

57292281 is a wasteful number, since it uses less digits than its factorization.

57292281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365815 (or 6365812 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 57292281 is about 7569.1664666593. The cubic root of 57292281 is about 385.5067953402.

The spelling of 57292281 in words is "fifty-seven million, two hundred ninety-two thousand, two hundred eighty-one".