31879109 has 2 divisors, whose sum is σ = 31879110. Its totient is φ = 31879108.

The previous prime is 31879103. The next prime is 31879123. The reversal of 31879109 is 90197813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16630084 + 15249025 = 4078^2 + 3905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31879109 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 (31879103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15939554 + 15939555.

It is an arithmetic number, because the mean of its divisors is an integer number (15939555).

Almost surely, 2^31879109 is an apocalyptic number.

It is an amenable number.

31879109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31879109 is an equidigital number, since it uses as much as digits as its factorization.

31879109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 31879109 is about 5646.1587827478. The cubic root of 31879109 is about 317.0799090014.

The spelling of 31879109 in words is "thirty-one million, eight hundred seventy-nine thousand, one hundred nine".