82791081 has 6 divisors (see below), whose sum is σ = 119587130. Its totient is φ = 55194048.

The previous prime is 82791073. The next prime is 82791097. The reversal of 82791081 is 18019728.

It can be written as a sum of positive squares in only one way, i.e., 74235456 + 8555625 = 8616^2 + 2925^2 .

It is not a de Polignac number, because 82791081 - 2³ = 82791073 is a prime.

It is a super-2 number, since 2×82791081² = 13708726186297122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82791001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4599496 + ... + 4599513.

Almost surely, 2^82791081 is an apocalyptic number.

It is an amenable number.

82791081 is a deficient number, since it is larger than the sum of its proper divisors (36796049).

82791081 is a wasteful number, since it uses less digits than its factorization.

82791081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9199015 (or 9199012 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 82791081 is about 9098.9604351266. The cubic root of 82791081 is about 435.8407678925.

The spelling of 82791081 in words is "eighty-two million, seven hundred ninety-one thousand, eighty-one".