31109369 has 2 divisors, whose sum is σ = 31109370. Its totient is φ = 31109368.

The previous prime is 31109359. The next prime is 31109387. The reversal of 31109369 is 96390113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30085225 + 1024144 = 5485^2 + 1012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31109369 is a prime.

It is a super-2 number, since 2×31109369² = 1935585679156322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31109359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554684 + 15554685.

It is an arithmetic number, because the mean of its divisors is an integer number (15554685).

Almost surely, 2^31109369 is an apocalyptic number.

It is an amenable number.

31109369 is a deficient number, since it is larger than the sum of its proper divisors (1).

31109369 is an equidigital number, since it uses as much as digits as its factorization.

31109369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31109369 is about 5577.5773414629. The cubic root of 31109369 is about 314.5070613779.

The spelling of 31109369 in words is "thirty-one million, one hundred nine thousand, three hundred sixty-nine".