921146931 has 16 divisors (see below), whose sum is σ = 1401546400. Its totient is φ = 597500064.

The previous prime is 921146929. The next prime is 921146939. The reversal of 921146931 is 139641129.

It is a happy number.

It is not a de Polignac number, because 921146931 - 2¹ = 921146929 is a prime.

It is a super-2 number, since 2×921146931² = 1697023336981437522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921146939) 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, 460036 + ... + 462033.

It is an arithmetic number, because the mean of its divisors is an integer number (87596650).

Almost surely, 2^921146931 is an apocalyptic number.

921146931 is a deficient number, since it is larger than the sum of its proper divisors (480399469).

921146931 is a wasteful number, since it uses less digits than its factorization.

921146931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922115 (or 922109 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 921146931 is about 30350.4024849754. The cubic root of 921146931 is about 972.9928222507.

The spelling of 921146931 in words is "nine hundred twenty-one million, one hundred forty-six thousand, nine hundred thirty-one".