31113911 has 2 divisors, whose sum is σ = 31113912. Its totient is φ = 31113910.

The previous prime is 31113889. The next prime is 31113923. The reversal of 31113911 is 11931113.

It is a strong prime.

It is an emirp because it is prime and its reverse (11931113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31113911 - 2⁶ = 31113847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556955 + 15556956.

It is an arithmetic number, because the mean of its divisors is an integer number (15556956).

Almost surely, 2^31113911 is an apocalyptic number.

31113911 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113911 is an equidigital number, since it uses as much as digits as its factorization.

31113911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81, while the sum is 20.

The square root of 31113911 is about 5577.9844926281. The cubic root of 31113911 is about 314.5223667516.

The spelling of 31113911 in words is "thirty-one million, one hundred thirteen thousand, nine hundred eleven".