31013249 has 2 divisors, whose sum is σ = 31013250. Its totient is φ = 31013248.

The previous prime is 31013239. The next prime is 31013251. The reversal of 31013249 is 94231013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 4129024 = 5185^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013249 - 2⁴ = 31013233 is a prime.

It is a super-2 number, since 2×31013249² = 1923643227072002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 31013251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31013239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506624 + 15506625.

It is an arithmetic number, because the mean of its divisors is an integer number (15506625).

Almost surely, 2^31013249 is an apocalyptic number.

It is an amenable number.

31013249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013249 is an equidigital number, since it uses as much as digits as its factorization.

31013249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31013249 is about 5568.9540310547. The cubic root of 31013249 is about 314.1828117170.

The spelling of 31013249 in words is "thirty-one million, thirteen thousand, two hundred forty-nine".