31342439 has 2 divisors, whose sum is σ = 31342440. Its totient is φ = 31342438.

The previous prime is 31342429. The next prime is 31342447. The reversal of 31342439 is 93424313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31342439 - 2⁸ = 31342183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31342429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671219 + 15671220.

It is an arithmetic number, because the mean of its divisors is an integer number (15671220).

Almost surely, 2^31342439 is an apocalyptic number.

31342439 is a deficient number, since it is larger than the sum of its proper divisors (1).

31342439 is an equidigital number, since it uses as much as digits as its factorization.

31342439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 31342439 is about 5598.4318340049. The cubic root of 31342439 is about 315.2905323220.

The spelling of 31342439 in words is "thirty-one million, three hundred forty-two thousand, four hundred thirty-nine".