31261542122440 has 96 divisors (see below), whose sum is σ = 82173471452280. Its totient is φ = 10672241814528.

The previous prime is 31261542122423. The next prime is 31261542122467. The reversal of 31261542122440 is 4422124516213.

It can be written as a sum of positive squares in 4 ways, for example, as 21723932879236 + 9537609243204 = 4660894^2 + 3088302^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31261542122440.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33770287 + ... + 34683646.

Almost surely, 2^{31261542122440} is an apocalyptic number.

It is an amenable number.

31261542122440 is an abundant number, since it is smaller than the sum of its proper divisors (50911929329840).

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

31261542122440 is a wasteful number, since it uses less digits than its factorization.

31261542122440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68454191 (or 68454180 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

Adding to 31261542122440 its reverse (4422124516213), we get a palindrome (35683666638653).

The spelling of 31261542122440 in words is "thirty-one trillion, two hundred sixty-one billion, five hundred forty-two million, one hundred twenty-two thousand, four hundred forty".