57211431 has 4 divisors (see below), whose sum is σ = 76281912. Its totient is φ = 38140952.

The previous prime is 57211423. The next prime is 57211463. The reversal of 57211431 is 13411275.

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

It is a cyclic number.

It is not a de Polignac number, because 57211431 - 2³ = 57211423 is a prime.

It is a super-2 number, since 2×57211431² = 6546295674135522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57211471) 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, 9535236 + ... + 9535241.

It is an arithmetic number, because the mean of its divisors is an integer number (19070478).

Almost surely, 2^57211431 is an apocalyptic number.

57211431 is a deficient number, since it is larger than the sum of its proper divisors (19070481).

57211431 is a wasteful number, since it uses less digits than its factorization.

57211431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19070480.

The product of its digits is 840, while the sum is 24.

The square root of 57211431 is about 7563.8238345429. The cubic root of 57211431 is about 385.3253695195.

The spelling of 57211431 in words is "fifty-seven million, two hundred eleven thousand, four hundred thirty-one".