31091343680 has 42 divisors (see below), whose sum is σ = 74043773934. Its totient is φ = 12435275776.

The previous prime is 31091343677. The next prime is 31091343691. The reversal of 31091343680 is 8634319013.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1095874816 + 29995468864 = 33104^2 + 173192^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3149312 + ... + 3159168.

Almost surely, 2^31091343680 is an apocalyptic number.

It is an amenable number.

31091343680 is an abundant number, since it is smaller than the sum of its proper divisors (42952430254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31091343680 is an frugal number, since it uses more digits than its factorization.

31091343680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19731 (or 9864 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 31091343680 in words is "thirty-one billion, ninety-one million, three hundred forty-three thousand, six hundred eighty".