921431331 has 24 divisors (see below), whose sum is σ = 1428570000. Its totient is φ = 570226176.

The previous prime is 921431323. The next prime is 921431377. The reversal of 921431331 is 133134129.

It is not a de Polignac number, because 921431331 - 2³ = 921431323 is a prime.

It is a super-2 number, since 2×921431331² = 1698071395496863122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 921431295 and 921431304.

It is not an unprimeable number, because it can be changed into a prime (921431531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30081 + ... + 52418.

It is an arithmetic number, because the mean of its divisors is an integer number (59523750).

Almost surely, 2^921431331 is an apocalyptic number.

921431331 is a deficient number, since it is larger than the sum of its proper divisors (507138669).

921431331 is a wasteful number, since it uses less digits than its factorization.

921431331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82595 (or 82592 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 921431331 is about 30355.0873989847. The cubic root of 921431331 is about 973.0929476760.

The spelling of 921431331 in words is "nine hundred twenty-one million, four hundred thirty-one thousand, three hundred thirty-one".