57219391 has 4 divisors (see below), whose sum is σ = 57241800. Its totient is φ = 57196984.

The previous prime is 57219389. The next prime is 57219401. The reversal of 57219391 is 19391275.

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 57219391 - 2¹ = 57219389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57219391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57219301) 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, 6796 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (14310450).

Almost surely, 2^57219391 is an apocalyptic number.

57219391 is a deficient number, since it is larger than the sum of its proper divisors (22409).

57219391 is a wasteful number, since it uses less digits than its factorization.

57219391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22408.

The product of its digits is 17010, while the sum is 37.

The square root of 57219391 is about 7564.3500051227. The cubic root of 57219391 is about 385.3432391868.

The spelling of 57219391 in words is "fifty-seven million, two hundred nineteen thousand, three hundred ninety-one".