8131891896 has 24 divisors (see below), whose sum is σ = 22023874080. Its totient is φ = 2710630608.

The previous prime is 8131891853. The next prime is 8131891897. The reversal of 8131891896 is 6981981318.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×8131891896² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131891897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56471400 + ... + 56471543.

It is an arithmetic number, because the mean of its divisors is an integer number (917661420).

Almost surely, 2^8131891896 is an apocalyptic number.

It is an amenable number.

8131891896 is an abundant number, since it is smaller than the sum of its proper divisors (13891982184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8131891896 is a wasteful number, since it uses less digits than its factorization.

8131891896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112942955 (or 112942948 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 8131891896 is about 90177.0031438171. The cubic root of 8131891896 is about 2010.9311376021.

The spelling of 8131891896 in words is "eight billion, one hundred thirty-one million, eight hundred ninety-one thousand, eight hundred ninety-six".