57273281 has 4 divisors (see below), whose sum is σ = 61678932. Its totient is φ = 52867632.

The previous prime is 57273263. The next prime is 57273283. The reversal of 57273281 is 18237275.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32433025 + 24840256 = 5695^2 + 4984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57273281 is a prime.

It is a super-2 number, since 2×57273281² = 6560457433009922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57273283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202806 + ... + 2202831.

It is an arithmetic number, because the mean of its divisors is an integer number (15419733).

Almost surely, 2^57273281 is an apocalyptic number.

It is an amenable number.

57273281 is a deficient number, since it is larger than the sum of its proper divisors (4405651).

57273281 is a wasteful number, since it uses less digits than its factorization.

57273281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405650.

The product of its digits is 23520, while the sum is 35.

The square root of 57273281 is about 7567.9112706215. The cubic root of 57273281 is about 385.4641750614.

The spelling of 57273281 in words is "fifty-seven million, two hundred seventy-three thousand, two hundred eighty-one".