31587720447023 has 8 divisors (see below), whose sum is σ = 34023130068816. Its totient is φ = 29153108678400.

The previous prime is 31587720447011. The next prime is 31587720447061. The reversal of 31587720447023 is 32074402778513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31587720447023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31587720347023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199381058 + ... + 199539423.

It is an arithmetic number, because the mean of its divisors is an integer number (4252891258602).

Almost surely, 2^{31587720447023} is an apocalyptic number.

31587720447023 is a deficient number, since it is larger than the sum of its proper divisors (2435409621793).

31587720447023 is a wasteful number, since it uses less digits than its factorization.

31587720447023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398926585.

The product of its (nonzero) digits is 7902720, while the sum is 53.

The spelling of 31587720447023 in words is "thirty-one trillion, five hundred eighty-seven billion, seven hundred twenty million, four hundred forty-seven thousand, twenty-three".