31347431723 has 2 divisors, whose sum is σ = 31347431724. Its totient is φ = 31347431722.

The previous prime is 31347431683. The next prime is 31347431749. The reversal of 31347431723 is 32713474313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31347431723 - 2³⁰ = 30273689899 is a prime.

It is a super-2 number, since 2×31347431723² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31347461723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15673715861 + 15673715862.

It is an arithmetic number, because the mean of its divisors is an integer number (15673715862).

Almost surely, 2^31347431723 is an apocalyptic number.

31347431723 is a deficient number, since it is larger than the sum of its proper divisors (1).

31347431723 is an equidigital number, since it uses as much as digits as its factorization.

31347431723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 38.

The spelling of 31347431723 in words is "thirty-one billion, three hundred forty-seven million, four hundred thirty-one thousand, seven hundred twenty-three".