81835169031 has 36 divisors (see below), whose sum is σ = 148490641936. Its totient is φ = 42511772160.

The previous prime is 81835168999. The next prime is 81835169051. The reversal of 81835169031 is 13096153818.

It is a happy number.

81835169031 is a `hidden beast` number, since 8 + 18 + 3 + 516 + 90 + 31 = 666.

It is not a de Polignac number, because 81835169031 - 2⁵ = 81835168999 is a prime.

It is a super-2 number, since 2×81835169031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835169051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5360026 + ... + 5375271.

Almost surely, 2^81835169031 is an apocalyptic number.

81835169031 is a deficient number, since it is larger than the sum of its proper divisors (66655472905).

81835169031 is a wasteful number, since it uses less digits than its factorization.

81835169031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10735332 (or 10735318 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 81835169031 in words is "eighty-one billion, eight hundred thirty-five million, one hundred sixty-nine thousand, thirty-one".