31101979 has 2 divisors, whose sum is σ = 31101980. Its totient is φ = 31101978.

The previous prime is 31101977. The next prime is 31101989. The reversal of 31101979 is 97910113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31101979 - 2¹ = 31101977 is a prime.

Together with 31101977, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31101979.

It is not a weakly prime, because it can be changed into another prime (31101971) 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, 15550989 + 15550990.

It is an arithmetic number, because the mean of its divisors is an integer number (15550990).

Almost surely, 2^31101979 is an apocalyptic number.

31101979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31101979 is an equidigital number, since it uses as much as digits as its factorization.

31101979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 31101979 is about 5576.9148281106. The cubic root of 31101979 is about 314.4821557913.

The spelling of 31101979 in words is "thirty-one million, one hundred one thousand, nine hundred seventy-nine".