31274279 has 2 divisors, whose sum is σ = 31274280. Its totient is φ = 31274278.

The previous prime is 31274263. The next prime is 31274297. The reversal of 31274279 is 97247213.

Together with next prime (31274297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31274279 - 2⁴ = 31274263 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 (31274179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637139 + 15637140.

It is an arithmetic number, because the mean of its divisors is an integer number (15637140).

Almost surely, 2^31274279 is an apocalyptic number.

31274279 is a deficient number, since it is larger than the sum of its proper divisors (1).

31274279 is an equidigital number, since it uses as much as digits as its factorization.

31274279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 31274279 is about 5592.3411019000. The cubic root of 31274279 is about 315.0618136860.

The spelling of 31274279 in words is "thirty-one million, two hundred seventy-four thousand, two hundred seventy-nine".