8253971531991 has 24 divisors (see below), whose sum is σ = 12385037019264. Its totient is φ = 5493273406200.

The previous prime is 8253971531957. The next prime is 8253971532007. The reversal of 8253971531991 is 1991351793528.

8253971531991 is a `hidden beast` number, since 8 + 2 + 5 + 3 + 9 + 7 + 1 + 531 + 9 + 91 = 666.

It is not a de Polignac number, because 8253971531991 - 2²⁷ = 8253837314263 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8253971531951) 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, 28790035 + ... + 29075316.

It is an arithmetic number, because the mean of its divisors is an integer number (516043209136).

Almost surely, 2^{8253971531991} is an apocalyptic number.

8253971531991 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

8253971531991 is a deficient number, since it is larger than the sum of its proper divisors (4131065487273).

8253971531991 is an equidigital number, since it uses as much as digits as its factorization.

8253971531991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57865953 (or 57865941 counting only the distinct ones).

The product of its digits is 18370800, while the sum is 63.

The spelling of 8253971531991 in words is "eight trillion, two hundred fifty-three billion, nine hundred seventy-one million, five hundred thirty-one thousand, nine hundred ninety-one".