31013399 has 2 divisors, whose sum is σ = 31013400. Its totient is φ = 31013398.

The previous prime is 31013371. The next prime is 31013401. The reversal of 31013399 is 99331013.

It is a strong prime.

It is an emirp because it is prime and its reverse (99331013) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31013399 is a prime.

Together with 31013401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506699 + 15506700.

It is an arithmetic number, because the mean of its divisors is an integer number (15506700).

Almost surely, 2^31013399 is an apocalyptic number.

31013399 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013399 is an equidigital number, since it uses as much as digits as its factorization.

31013399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 31013399 is about 5568.9674985584. The cubic root of 31013399 is about 314.1833182461.

The spelling of 31013399 in words is "thirty-one million, thirteen thousand, three hundred ninety-nine".