31742591 has 2 divisors, whose sum is σ = 31742592. Its totient is φ = 31742590.

The previous prime is 31742567. The next prime is 31742593. The reversal of 31742591 is 19524713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31742591 - 2⁶ = 31742527 is a prime.

Together with 31742593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31742593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15871295 + 15871296.

It is an arithmetic number, because the mean of its divisors is an integer number (15871296).

Almost surely, 2^31742591 is an apocalyptic number.

31742591 is a deficient number, since it is larger than the sum of its proper divisors (1).

31742591 is an equidigital number, since it uses as much as digits as its factorization.

31742591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 31742591 is about 5634.0563539958. The cubic root of 31742591 is about 316.6266440031.

The spelling of 31742591 in words is "thirty-one million, seven hundred forty-two thousand, five hundred ninety-one".