31342739 has 2 divisors, whose sum is σ = 31342740. Its totient is φ = 31342738.

The previous prime is 31342733. The next prime is 31342771. The reversal of 31342739 is 93724313.

It is an a-pointer prime, because the next prime (31342771) can be obtained adding 31342739 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31342739 - 2⁸ = 31342483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31342733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671369 + 15671370.

It is an arithmetic number, because the mean of its divisors is an integer number (15671370).

Almost surely, 2^31342739 is an apocalyptic number.

31342739 is a deficient number, since it is larger than the sum of its proper divisors (1).

31342739 is an equidigital number, since it uses as much as digits as its factorization.

31342739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 31342739 is about 5598.4586271580. The cubic root of 31342739 is about 315.2915382728.

The spelling of 31342739 in words is "thirty-one million, three hundred forty-two thousand, seven hundred thirty-nine".