57211447 has 4 divisors (see below), whose sum is σ = 57227616. Its totient is φ = 57195280.

The previous prime is 57211423. The next prime is 57211463. The reversal of 57211447 is 74411275.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57211447 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57214447) 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, 238 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (14306904).

Almost surely, 2^57211447 is an apocalyptic number.

57211447 is a deficient number, since it is larger than the sum of its proper divisors (16169).

57211447 is a wasteful number, since it uses less digits than its factorization.

57211447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16168.

The product of its digits is 7840, while the sum is 31.

The square root of 57211447 is about 7563.8248922090. The cubic root of 57211447 is about 385.3254054401.

The spelling of 57211447 in words is "fifty-seven million, two hundred eleven thousand, four hundred forty-seven".