81497343131 has 8 divisors (see below), whose sum is σ = 85886795280. Its totient is φ = 77117902848.

The previous prime is 81497343127. The next prime is 81497343149. The reversal of 81497343131 is 13134379418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81497343131 - 2² = 81497343127 is a prime.

It is a super-2 number, since 2×81497343131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81497346131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486246 + ... + 2518811.

It is an arithmetic number, because the mean of its divisors is an integer number (10735849410).

Almost surely, 2^81497343131 is an apocalyptic number.

81497343131 is a deficient number, since it is larger than the sum of its proper divisors (4389452149).

81497343131 is a wasteful number, since it uses less digits than its factorization.

81497343131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005933.

The product of its digits is 217728, while the sum is 44.

The spelling of 81497343131 in words is "eighty-one billion, four hundred ninety-seven million, three hundred forty-three thousand, one hundred thirty-one".