31000939 has 2 divisors, whose sum is σ = 31000940. Its totient is φ = 31000938.

The previous prime is 31000933. The next prime is 31000969. The reversal of 31000939 is 93900013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31000939 - 2⁷ = 31000811 is a prime.

It is a super-2 number, since 2×31000939² = 1922116437763442, which contains 22 as substring.

It is equal to p_1916035 and since 31000939 and 1916035 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31000933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500469 + 15500470.

It is an arithmetic number, because the mean of its divisors is an integer number (15500470).

Almost surely, 2^31000939 is an apocalyptic number.

31000939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000939 is an equidigital number, since it uses as much as digits as its factorization.

31000939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 31000939 is about 5567.8486868808. The cubic root of 31000939 is about 314.1412369882.

The spelling of 31000939 in words is "thirty-one million, nine hundred thirty-nine", and thus it is an aban number.