8180631921 has 64 divisors (see below), whose sum is σ = 13771929600. Its totient is φ = 4195929600.

The previous prime is 8180631911. The next prime is 8180631929. The reversal of 8180631921 is 1291360818.

It is not a de Polignac number, because 8180631921 - 2⁹ = 8180631409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8180631921.

It is not an unprimeable number, because it can be changed into a prime (8180631929) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14326566 + ... + 14327136.

It is an arithmetic number, because the mean of its divisors is an integer number (215186400).

Almost surely, 2^8180631921 is an apocalyptic number.

It is an amenable number.

8180631921 is a deficient number, since it is larger than the sum of its proper divisors (5591297679).

8180631921 is a wasteful number, since it uses less digits than its factorization.

8180631921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 8180631921 is about 90446.8458322345. The cubic root of 8180631921 is about 2014.9407688648.

The spelling of 8180631921 in words is "eight billion, one hundred eighty million, six hundred thirty-one thousand, nine hundred twenty-one".