31961440368024 has 128 divisors (see below), whose sum is σ = 84698601108480. Its totient is φ = 10029654835200.

The previous prime is 31961440367999. The next prime is 31961440368043. The reversal of 31961440368024 is 42086304416913.

It is a Cunningham number, because it is equal to 5653445²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21907104 + ... + 23320464.

It is an arithmetic number, because the mean of its divisors is an integer number (661707821160).

Almost surely, 2^{31961440368024} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31961440368024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42349300554240).

31961440368024 is an abundant number, since it is smaller than the sum of its proper divisors (52737160740456).

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

31961440368024 is a wasteful number, since it uses less digits than its factorization.

31961440368024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414041 (or 1414037 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 31961440368024 in words is "thirty-one trillion, nine hundred sixty-one billion, four hundred forty million, three hundred sixty-eight thousand, twenty-four".