31491096639824 has 10 divisors (see below), whose sum is σ = 61013999739690. Its totient is φ = 15745548319904.

The previous prime is 31491096639809. The next prime is 31491096639859. The reversal of 31491096639824 is 42893669019413.

It can be written as a sum of positive squares in only one way, i.e., 30037721726224 + 1453374913600 = 5480668^2 + 1205560^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984096769979 + ... + 984096770010.

It is an arithmetic number, because the mean of its divisors is an integer number (6101399973969).

Almost surely, 2^{31491096639824} is an apocalyptic number.

It is an amenable number.

31491096639824 is a deficient number, since it is larger than the sum of its proper divisors (29522903099866).

31491096639824 is a wasteful number, since it uses less digits than its factorization.

31491096639824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968193539997 (or 1968193539991 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 65.

The spelling of 31491096639824 in words is "thirty-one trillion, four hundred ninety-one billion, ninety-six million, six hundred thirty-nine thousand, eight hundred twenty-four".