8701974907921 has 9 divisors (see below), whose sum is σ = 9096842427771. Its totient is φ = 8323563274752.

The previous prime is 8701974907909. The next prime is 8701974907931. The reversal of 8701974907921 is 1297094791078.

The square root of 8701974907921 is 2949911.

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

It can be written as a sum of positive squares in only one way, i.e., 8294083203025 + 407891704896 = 2879945^2 + 638664^2 .

It is not a de Polignac number, because 8701974907921 - 2¹⁹ = 8701974383633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8701974907931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 67783825 + ... + 67912081.

Almost surely, 2^{8701974907921} is an apocalyptic number.

8701974907921 is the 2949911-st square number.

8701974907921 is the 1474956-th centered octagonal number.

It is an amenable number.

8701974907921 is a deficient number, since it is larger than the sum of its proper divisors (394867519850).

8701974907921 is an frugal number, since it uses more digits than its factorization.

8701974907921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256560 (or 128280 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 64.

Multiplying 8701974907921 by its sum of digits (64), we get a square (556926394106944 = 23599288²).

The spelling of 8701974907921 in words is "eight trillion, seven hundred one billion, nine hundred seventy-four million, nine hundred seven thousand, nine hundred twenty-one".