31612685851 has 2 divisors, whose sum is σ = 31612685852. Its totient is φ = 31612685850.

The previous prime is 31612685831. The next prime is 31612685957. The reversal of 31612685851 is 15858621613.

It is a weak prime.

It is an emirp because it is prime and its reverse (15858621613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31612685851 - 2⁷ = 31612685723 is a prime.

It is not a weakly prime, because it can be changed into another prime (31612685821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806342925 + 15806342926.

It is an arithmetic number, because the mean of its divisors is an integer number (15806342926).

Almost surely, 2^31612685851 is an apocalyptic number.

31612685851 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612685851 is an equidigital number, since it uses as much as digits as its factorization.

31612685851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 46.

The spelling of 31612685851 in words is "thirty-one billion, six hundred twelve million, six hundred eighty-five thousand, eight hundred fifty-one".