31038013 has 2 divisors, whose sum is σ = 31038014. Its totient is φ = 31038012.

The previous prime is 31038011. The next prime is 31038031. The reversal of 31038013 is 31083013.

Together with next prime (31038031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18207289 + 12830724 = 4267^2 + 3582^2 .

It is a cyclic number.

It is not a de Polignac number, because 31038013 - 2¹ = 31038011 is a prime.

Together with 31038011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31038011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15519006 + 15519007.

It is an arithmetic number, because the mean of its divisors is an integer number (15519007).

Almost surely, 2^31038013 is an apocalyptic number.

It is an amenable number.

31038013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31038013 is an equidigital number, since it uses as much as digits as its factorization.

31038013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31038013 is about 5571.1769851621. The cubic root of 31038013 is about 314.2664141926.

The spelling of 31038013 in words is "thirty-one million, thirty-eight thousand, thirteen".