31718876851 has 2 divisors, whose sum is σ = 31718876852. Its totient is φ = 31718876850.

The previous prime is 31718876843. The next prime is 31718876881. The reversal of 31718876851 is 15867881713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31718876851 - 2³ = 31718876843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31718876792 and 31718876801.

It is not a weakly prime, because it can be changed into another prime (31718876801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859438425 + 15859438426.

It is an arithmetic number, because the mean of its divisors is an integer number (15859438426).

Almost surely, 2^31718876851 is an apocalyptic number.

31718876851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31718876851 is an equidigital number, since it uses as much as digits as its factorization.

31718876851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 55.

The spelling of 31718876851 in words is "thirty-one billion, seven hundred eighteen million, eight hundred seventy-six thousand, eight hundred fifty-one".