31813344087489 has 24 divisors (see below), whose sum is σ = 48771826215840. Its totient is φ = 19913673529728.

The previous prime is 31813344087479. The next prime is 31813344087529. The reversal of 31813344087489 is 98478044331813.

31813344087489 is a `hidden beast` number, since 3 + 1 + 8 + 1 + 3 + 34 + 40 + 87 + 489 = 666.

It is not a de Polignac number, because 31813344087489 - 2¹⁹ = 31813343563201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31813344087419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248062807 + ... + 248191020.

It is an arithmetic number, because the mean of its divisors is an integer number (2032159425660).

Almost surely, 2^{31813344087489} is an apocalyptic number.

It is an amenable number.

31813344087489 is a deficient number, since it is larger than the sum of its proper divisors (16958482128351).

31813344087489 is a wasteful number, since it uses less digits than its factorization.

31813344087489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496254269 (or 496254266 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 31813344087489 in words is "thirty-one trillion, eight hundred thirteen billion, three hundred forty-four million, eighty-seven thousand, four hundred eighty-nine".