57257551 has 4 divisors (see below), whose sum is σ = 61661992. Its totient is φ = 52853112.

The previous prime is 57257549. The next prime is 57257561. The reversal of 57257551 is 15575275.

It is a happy number.

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

It is not a de Polignac number, because 57257551 - 2¹ = 57257549 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 57257551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57257521) 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, 2202201 + ... + 2202226.

It is an arithmetic number, because the mean of its divisors is an integer number (15415498).

Almost surely, 2^57257551 is an apocalyptic number.

57257551 is a deficient number, since it is larger than the sum of its proper divisors (4404441).

57257551 is a wasteful number, since it uses less digits than its factorization.

57257551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404440.

The product of its digits is 61250, while the sum is 37.

The square root of 57257551 is about 7566.8719428837. The cubic root of 57257551 is about 385.4288828242.

The spelling of 57257551 in words is "fifty-seven million, two hundred fifty-seven thousand, five hundred fifty-one".