8572722921 has 27 divisors (see below), whose sum is σ = 14407775031. Its totient is φ = 4897587744.

The previous prime is 8572722911. The next prime is 8572722929. The reversal of 8572722921 is 1292272758.

The square root of 8572722921 is 92589.

It is a perfect power (a square), and thus also a powerful number.

8572722921 is a `hidden beast` number, since 8 + 572 + 72 + 2 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 644601321 + 7928121600 = 25389^2 + 89040^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8572722921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8572722929) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1942165 + ... + 1946573.

Almost surely, 2^8572722921 is an apocalyptic number.

8572722921 is the 92589-th square number.

8572722921 is the 46295-th centered octagonal number.

It is an amenable number.

8572722921 is a deficient number, since it is larger than the sum of its proper divisors (5835052110).

8572722921 is an frugal number, since it uses more digits than its factorization.

8572722921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8838 (or 4419 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The cubic root of 8572722921 is about 2046.6312246719.

The spelling of 8572722921 in words is "eight billion, five hundred seventy-two million, seven hundred twenty-two thousand, nine hundred twenty-one".