31198613 has 2 divisors, whose sum is σ = 31198614. Its totient is φ = 31198612.

The previous prime is 31198591. The next prime is 31198619. The reversal of 31198613 is 31689113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15816529 + 15382084 = 3977^2 + 3922^2 .

It is an emirp because it is prime and its reverse (31689113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31198613 - 2⁶ = 31198549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31198613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31198619) 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, 15599306 + 15599307.

It is an arithmetic number, because the mean of its divisors is an integer number (15599307).

Almost surely, 2^31198613 is an apocalyptic number.

It is an amenable number.

31198613 is a deficient number, since it is larger than the sum of its proper divisors (1).

31198613 is an equidigital number, since it uses as much as digits as its factorization.

31198613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 31198613 is about 5585.5718597114. The cubic root of 31198613 is about 314.8075182518.

The spelling of 31198613 in words is "thirty-one million, one hundred ninety-eight thousand, six hundred thirteen".