81793179 has 32 divisors (see below), whose sum is σ = 131264000. Its totient is φ = 50038560.

The previous prime is 81793169. The next prime is 81793183. The reversal of 81793179 is 97139718.

It is not a de Polignac number, because 81793179 - 2¹² = 81789083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81793139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69264 + ... + 70434.

It is an arithmetic number, because the mean of its divisors is an integer number (4102000).

Almost surely, 2^81793179 is an apocalyptic number.

81793179 is a deficient number, since it is larger than the sum of its proper divisors (49470821).

81793179 is a wasteful number, since it uses less digits than its factorization.

81793179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1386 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 81793179 is about 9043.9581489523. The cubic root of 81793179 is about 434.0825849622.

The spelling of 81793179 in words is "eighty-one million, seven hundred ninety-three thousand, one hundred seventy-nine".