57155761 has 4 divisors (see below), whose sum is σ = 61552372. Its totient is φ = 52759152.

The previous prime is 57155753. The next prime is 57155779. The reversal of 57155761 is 16755175.

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 19713600 + 37442161 = 4440^2 + 6119^2 .

It is a cyclic number.

It is not a de Polignac number, because 57155761 - 2³ = 57155753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57155761.

It is not an unprimeable number, because it can be changed into a prime (57155731) 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, 2198286 + ... + 2198311.

It is an arithmetic number, because the mean of its divisors is an integer number (15388093).

Almost surely, 2^57155761 is an apocalyptic number.

It is an amenable number.

57155761 is a deficient number, since it is larger than the sum of its proper divisors (4396611).

57155761 is a wasteful number, since it uses less digits than its factorization.

57155761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396610.

The product of its digits is 36750, while the sum is 37.

The square root of 57155761 is about 7560.1429219295. The cubic root of 57155761 is about 385.2003477397.

It can be divided in two parts, 5715 and 5761, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 57155761 in words is "fifty-seven million, one hundred fifty-five thousand, seven hundred sixty-one".