8572872921 has 4 divisors (see below), whose sum is σ = 11430497232. Its totient is φ = 5715248612.

The previous prime is 8572872911. The next prime is 8572872923. The reversal of 8572872921 is 1292782758.

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 8572872921 - 2⁶ = 8572872857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8572872923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428812151 + ... + 1428812156.

It is an arithmetic number, because the mean of its divisors is an integer number (2857624308).

Almost surely, 2^8572872921 is an apocalyptic number.

It is an amenable number.

8572872921 is a deficient number, since it is larger than the sum of its proper divisors (2857624311).

8572872921 is a wasteful number, since it uses less digits than its factorization.

8572872921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857624310.

The product of its digits is 1128960, while the sum is 51.

The square root of 8572872921 is about 92589.8100278859. The cubic root of 8572872921 is about 2046.6431614818.

The spelling of 8572872921 in words is "eight billion, five hundred seventy-two million, eight hundred seventy-two thousand, nine hundred twenty-one".