31343591 has 2 divisors, whose sum is σ = 31343592. Its totient is φ = 31343590.

The previous prime is 31343567. The next prime is 31343651. The reversal of 31343591 is 19534313.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31343591 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 (31343561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671795 + 15671796.

It is an arithmetic number, because the mean of its divisors is an integer number (15671796).

Almost surely, 2^31343591 is an apocalyptic number.

31343591 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343591 is an equidigital number, since it uses as much as digits as its factorization.

31343591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 29.

The square root of 31343591 is about 5598.5347190135. The cubic root of 31343591 is about 315.2943951382.

The spelling of 31343591 in words is "thirty-one million, three hundred forty-three thousand, five hundred ninety-one".