31291712723 has 2 divisors, whose sum is σ = 31291712724. Its totient is φ = 31291712722.

The previous prime is 31291712719. The next prime is 31291712743. The reversal of 31291712723 is 32721719213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31291712723 - 2² = 31291712719 is a prime.

It is not a weakly prime, because it can be changed into another prime (31291712743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645856361 + 15645856362.

It is an arithmetic number, because the mean of its divisors is an integer number (15645856362).

Almost surely, 2^31291712723 is an apocalyptic number.

31291712723 is a deficient number, since it is larger than the sum of its proper divisors (1).

31291712723 is an equidigital number, since it uses as much as digits as its factorization.

31291712723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The spelling of 31291712723 in words is "thirty-one billion, two hundred ninety-one million, seven hundred twelve thousand, seven hundred twenty-three".