921931 has 2 divisors, whose sum is σ = 921932. Its totient is φ = 921930.

The previous prime is 921919. The next prime is 921959. The reversal of 921931 is 139129.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921931 - 2¹¹ = 919883 is a prime.

It is a super-2 number, since 2×921931² = 1699913537522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 921896 and 921905.

It is not a weakly prime, because it can be changed into another prime (921901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460965 + 460966.

It is an arithmetic number, because the mean of its divisors is an integer number (460966).

2⁹²¹⁹³¹ is an apocalyptic number.

921931 is a deficient number, since it is larger than the sum of its proper divisors (1).

921931 is an equidigital number, since it uses as much as digits as its factorization.

921931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 25.

The square root of 921931 is about 960.1723803568. The cubic root of 921931 is about 97.3268810489.

The spelling of 921931 in words is "nine hundred twenty-one thousand, nine hundred thirty-one".