31497265020855 has 16 divisors (see below), whose sum is σ = 50395773777120. Its totient is φ = 16798491429888.

The previous prime is 31497265020803. The next prime is 31497265020857. The reversal of 31497265020855 is 55802056279413.

It is not a de Polignac number, because 31497265020855 - 2⁶ = 31497265020791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31497265020795 and 31497265020804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31497265020857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2413359 + ... + 8295711.

It is an arithmetic number, because the mean of its divisors is an integer number (3149735861070).

It is a 1-persistent number, because it is pandigital, but 2⋅31497265020855 = 62994530041710 is not.

Almost surely, 2^{31497265020855} is an apocalyptic number.

31497265020855 is a deficient number, since it is larger than the sum of its proper divisors (18898508756265).

31497265020855 is a wasteful number, since it uses less digits than its factorization.

31497265020855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239330.

The product of its (nonzero) digits is 18144000, while the sum is 57.

The spelling of 31497265020855 in words is "thirty-one trillion, four hundred ninety-seven billion, two hundred sixty-five million, twenty thousand, eight hundred fifty-five".