31897162912655 has 16 divisors (see below), whose sum is σ = 38584750546080. Its totient is φ = 25312959554688.

The previous prime is 31897162912649. The next prime is 31897162912669. The reversal of 31897162912655 is 55621926179813.

It is a cyclic number.

It is not a de Polignac number, because 31897162912655 - 2⁶ = 31897162912591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31897162912591 and 31897162912600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41236820 + ... + 42003209.

It is an arithmetic number, because the mean of its divisors is an integer number (2411546909130).

Almost surely, 2^{31897162912655} is an apocalyptic number.

31897162912655 is a deficient number, since it is larger than the sum of its proper divisors (6687587633425).

31897162912655 is a wasteful number, since it uses less digits than its factorization.

31897162912655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83240650.

The product of its digits is 48988800, while the sum is 65.

The spelling of 31897162912655 in words is "thirty-one trillion, eight hundred ninety-seven billion, one hundred sixty-two million, nine hundred twelve thousand, six hundred fifty-five".