81153931197 has 16 divisors (see below), whose sum is σ = 110438043840. Its totient is φ = 52989760512.

The previous prime is 81153931171. The next prime is 81153931207. The reversal of 81153931197 is 79113935118.

It is not a de Polignac number, because 81153931197 - 2⁸ = 81153930941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81153931597) 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, 350547 + ... + 534032.

It is an arithmetic number, because the mean of its divisors is an integer number (6902377740).

Almost surely, 2^81153931197 is an apocalyptic number.

It is an amenable number.

81153931197 is a deficient number, since it is larger than the sum of its proper divisors (29284112643).

81153931197 is a wasteful number, since it uses less digits than its factorization.

81153931197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885212.

The product of its digits is 204120, while the sum is 48.

The spelling of 81153931197 in words is "eighty-one billion, one hundred fifty-three million, nine hundred thirty-one thousand, one hundred ninety-seven".