572191921 has 4 divisors (see below), whose sum is σ = 653933632. Its totient is φ = 490450212.

The previous prime is 572191891. The next prime is 572191931. The reversal of 572191921 is 129191275.

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 not a de Polignac number, because 572191921 - 2¹⁷ = 572060849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (572191931) 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, 40870845 + ... + 40870858.

It is an arithmetic number, because the mean of its divisors is an integer number (163483408).

Almost surely, 2^572191921 is an apocalyptic number.

It is an amenable number.

572191921 is a deficient number, since it is larger than the sum of its proper divisors (81741711).

572191921 is an equidigital number, since it uses as much as digits as its factorization.

572191921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81741710.

The product of its digits is 11340, while the sum is 37.

The square root of 572191921 is about 23920.5334597705. The cubic root of 572191921 is about 830.1958801247.

The spelling of 572191921 in words is "five hundred seventy-two million, one hundred ninety-one thousand, nine hundred twenty-one".