31612367881 has 2 divisors, whose sum is σ = 31612367882. Its totient is φ = 31612367880.

The previous prime is 31612367869. The next prime is 31612367911. The reversal of 31612367881 is 18876321613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28591766281 + 3020601600 = 169091^2 + 54960^2 .

It is a cyclic number.

It is not a de Polignac number, because 31612367881 - 2⁵ = 31612367849 is a prime.

It is a super-2 number, since 2×31612367881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31612367851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806183940 + 15806183941.

It is an arithmetic number, because the mean of its divisors is an integer number (15806183941).

Almost surely, 2^31612367881 is an apocalyptic number.

It is an amenable number.

31612367881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612367881 is an equidigital number, since it uses as much as digits as its factorization.

31612367881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The spelling of 31612367881 in words is "thirty-one billion, six hundred twelve million, three hundred sixty-seven thousand, eight hundred eighty-one".