9315989921 has 16 divisors (see below), whose sum is σ = 11260354560. Its totient is φ = 7528988880.

The previous prime is 9315989911. The next prime is 9315989927. The reversal of 9315989921 is 1299895139.

It is not a de Polignac number, because 9315989921 - 2¹⁰ = 9315988897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9315989927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137921 + ... + 194046.

It is an arithmetic number, because the mean of its divisors is an integer number (703772160).

Almost surely, 2^9315989921 is an apocalyptic number.

It is an amenable number.

9315989921 is a deficient number, since it is larger than the sum of its proper divisors (1944364639).

9315989921 is a wasteful number, since it uses less digits than its factorization.

9315989921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332204.

The product of its digits is 1574640, while the sum is 56.

The square root of 9315989921 is about 96519.3758838089. The cubic root of 9315989921 is about 2104.1482569156.

The spelling of 9315989921 in words is "nine billion, three hundred fifteen million, nine hundred eighty-nine thousand, nine hundred twenty-one".