57055531 has 12 divisors (see below), whose sum is σ = 63504336. Its totient is φ = 50956560.

The previous prime is 57055457. The next prime is 57055541. The reversal of 57055531 is 13555075.

It is not a de Polignac number, because 57055531 - 2⁷ = 57055403 is a prime.

It is a super-2 number, since 2×57055531² = 6510667235383922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57055493 and 57055502.

It is not an unprimeable number, because it can be changed into a prime (57055541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10210 + ... + 14776.

It is an arithmetic number, because the mean of its divisors is an integer number (5292028).

Almost surely, 2^57055531 is an apocalyptic number.

57055531 is a deficient number, since it is larger than the sum of its proper divisors (6448805).

57055531 is a wasteful number, since it uses less digits than its factorization.

57055531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642 (or 4611 counting only the distinct ones).

The product of its (nonzero) digits is 13125, while the sum is 31.

The square root of 57055531 is about 7553.5111703101. The cubic root of 57055531 is about 384.9750498252.

It can be divided in two parts, 5705 and 5531, that added together give a square (11236 = 106²).

The spelling of 57055531 in words is "fifty-seven million, fifty-five thousand, five hundred thirty-one".