31136393 has 2 divisors, whose sum is σ = 31136394. Its totient is φ = 31136392.

The previous prime is 31136389. The next prime is 31136407. The reversal of 31136393 is 39363113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26759929 + 4376464 = 5173^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 31136393 - 2² = 31136389 is a prime.

It is not a weakly prime, because it can be changed into another prime (31136353) 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, 15568196 + 15568197.

It is an arithmetic number, because the mean of its divisors is an integer number (15568197).

Almost surely, 2^31136393 is an apocalyptic number.

It is an amenable number.

31136393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31136393 is an equidigital number, since it uses as much as digits as its factorization.

31136393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 29.

The square root of 31136393 is about 5579.9993727598. Note that the first 3 decimals coincide. The cubic root of 31136393 is about 314.5981033936.

The spelling of 31136393 in words is "thirty-one million, one hundred thirty-six thousand, three hundred ninety-three".