31119013 has 2 divisors, whose sum is σ = 31119014. Its totient is φ = 31119012.

The previous prime is 31119007. The next prime is 31119037. The reversal of 31119013 is 31091113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21372129 + 9746884 = 4623^2 + 3122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31119013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31119043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15559506 + 15559507.

It is an arithmetic number, because the mean of its divisors is an integer number (15559507).

Almost surely, 2^31119013 is an apocalyptic number.

It is an amenable number.

31119013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31119013 is an equidigital number, since it uses as much as digits as its factorization.

31119013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 31119013 is about 5578.4418075301. The cubic root of 31119013 is about 314.5395574054.

The spelling of 31119013 in words is "thirty-one million, one hundred nineteen thousand, thirteen".