31236013 has 2 divisors, whose sum is σ = 31236014. Its totient is φ = 31236012.

The previous prime is 31235999. The next prime is 31236061. The reversal of 31236013 is 31063213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 14768649 = 4058^2 + 3843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31236013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31236083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15618006 + 15618007.

It is an arithmetic number, because the mean of its divisors is an integer number (15618007).

Almost surely, 2^31236013 is an apocalyptic number.

It is an amenable number.

31236013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31236013 is an equidigital number, since it uses as much as digits as its factorization.

31236013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 31236013 is about 5588.9187684202. The cubic root of 31236013 is about 314.9332620855.

Adding to 31236013 its reverse (31063213), we get a palindrome (62299226).

The spelling of 31236013 in words is "thirty-one million, two hundred thirty-six thousand, thirteen".