57216493 has 4 divisors (see below), whose sum is σ = 57367840. Its totient is φ = 57065148.

The previous prime is 57216491. The next prime is 57216499. The reversal of 57216493 is 39461275.

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 57216493 - 2¹ = 57216491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57216491) 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, 75105 + ... + 75862.

It is an arithmetic number, because the mean of its divisors is an integer number (14341960).

Almost surely, 2^57216493 is an apocalyptic number.

It is an amenable number.

57216493 is a deficient number, since it is larger than the sum of its proper divisors (151347).

57216493 is a wasteful number, since it uses less digits than its factorization.

57216493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151346.

The product of its digits is 45360, while the sum is 37.

The square root of 57216493 is about 7564.1584462516. The cubic root of 57216493 is about 385.3367335626.

The spelling of 57216493 in words is "fifty-seven million, two hundred sixteen thousand, four hundred ninety-three".