57121605 has 20 divisors (see below), whose sum is σ = 102396492. Its totient is φ = 30464640.

The previous prime is 57121601. The next prime is 57121607. The reversal of 57121605 is 50612175.

57121605 is a `hidden beast` number, since 57 + 1 + 2 + 1 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6441444 + 50680161 = 2538^2 + 7119^2 .

It is not a de Polignac number, because 57121605 - 2² = 57121601 is a prime.

It is a super-3 number, since 3×57121605³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57121601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 70116 + ... + 70925.

Almost surely, 2^57121605 is an apocalyptic number.

It is an amenable number.

57121605 is a deficient number, since it is larger than the sum of its proper divisors (45274887).

57121605 is a wasteful number, since it uses less digits than its factorization.

57121605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141058 (or 141049 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 57121605 is about 7557.8836323405. The cubic root of 57121605 is about 385.1236011759.

The spelling of 57121605 in words is "fifty-seven million, one hundred twenty-one thousand, six hundred five".