57211657 has 4 divisors (see below), whose sum is σ = 58757956. Its totient is φ = 55665360.

The previous prime is 57211639. The next prime is 57211663. The reversal of 57211657 is 75611275.

It is a happy number.

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 39200121 + 18011536 = 6261^2 + 4244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57211657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57211607) 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, 773094 + ... + 773167.

It is an arithmetic number, because the mean of its divisors is an integer number (14689489).

Almost surely, 2^57211657 is an apocalyptic number.

It is an amenable number.

57211657 is a deficient number, since it is larger than the sum of its proper divisors (1546299).

57211657 is a wasteful number, since it uses less digits than its factorization.

57211657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546298.

The product of its digits is 14700, while the sum is 34.

The square root of 57211657 is about 7563.8387740618. The cubic root of 57211657 is about 385.3258768973.

The spelling of 57211657 in words is "fifty-seven million, two hundred eleven thousand, six hundred fifty-seven".