81835132731 has 24 divisors (see below), whose sum is σ = 126247047360. Its totient is φ = 46986675120.

The previous prime is 81835132723. The next prime is 81835132849. The reversal of 81835132731 is 13723153818.

It is a happy number.

It is not a de Polignac number, because 81835132731 - 2³ = 81835132723 is a prime.

It is a super-2 number, since 2×81835132731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81835132711) 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 23 ways as a sum of consecutive naturals, for example, 5925765 + ... + 5939558.

It is an arithmetic number, because the mean of its divisors is an integer number (5260293640).

Almost surely, 2^81835132731 is an apocalyptic number.

81835132731 is a deficient number, since it is larger than the sum of its proper divisors (44411914629).

81835132731 is a wasteful number, since it uses less digits than its factorization.

81835132731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11865367 (or 11865356 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 81835132731 in words is "eighty-one billion, eight hundred thirty-five million, one hundred thirty-two thousand, seven hundred thirty-one".