57211989 has 4 divisors (see below), whose sum is σ = 76282656. Its totient is φ = 38141324.

The previous prime is 57211981. The next prime is 57211991. The reversal of 57211989 is 98911275.

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 a cyclic number.

It is not a de Polignac number, because 57211989 - 2³ = 57211981 is a prime.

It is a super-2 number, since 2×57211989² = 6546423370672242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 57211989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57211981) 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, 9535329 + ... + 9535334.

It is an arithmetic number, because the mean of its divisors is an integer number (19070664).

Almost surely, 2^57211989 is an apocalyptic number.

It is an amenable number.

57211989 is a deficient number, since it is larger than the sum of its proper divisors (19070667).

57211989 is a wasteful number, since it uses less digits than its factorization.

57211989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19070666.

The product of its digits is 45360, while the sum is 42.

The square root of 57211989 is about 7563.8607205580. The cubic root of 57211989 is about 385.3266222462.

It can be divided in two parts, 572 and 11989, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 57211989 in words is "fifty-seven million, two hundred eleven thousand, nine hundred eighty-nine".