57211257 has 4 divisors (see below), whose sum is σ = 76281680. Its totient is φ = 38140836.

The previous prime is 57211241. The next prime is 57211313. The reversal of 57211257 is 75211275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57211257 - 2⁴ = 57211241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57212257) 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, 9535207 + ... + 9535212.

It is an arithmetic number, because the mean of its divisors is an integer number (19070420).

Almost surely, 2^57211257 is an apocalyptic number.

It is an amenable number.

57211257 is a deficient number, since it is larger than the sum of its proper divisors (19070423).

57211257 is a wasteful number, since it uses less digits than its factorization.

57211257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19070422.

The product of its digits is 4900, while the sum is 30.

The square root of 57211257 is about 7563.8123324154. The cubic root of 57211257 is about 385.3249788827.

The spelling of 57211257 in words is "fifty-seven million, two hundred eleven thousand, two hundred fifty-seven".