31136939 has 2 divisors, whose sum is σ = 31136940. Its totient is φ = 31136938.

The previous prime is 31136929. The next prime is 31136947. The reversal of 31136939 is 93963113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31136939 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31136899 and 31136908.

It is not a weakly prime, because it can be changed into another prime (31136929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568469 + 15568470.

It is an arithmetic number, because the mean of its divisors is an integer number (15568470).

Almost surely, 2^31136939 is an apocalyptic number.

31136939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31136939 is an equidigital number, since it uses as much as digits as its factorization.

31136939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 35.

The square root of 31136939 is about 5580.0482972820. The cubic root of 31136939 is about 314.5999422874.

The spelling of 31136939 in words is "thirty-one million, one hundred thirty-six thousand, nine hundred thirty-nine".