81326167 has 4 divisors (see below), whose sum is σ = 87582040. Its totient is φ = 75070296.

The previous prime is 81326159. The next prime is 81326171. The reversal of 81326167 is 76162318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76162318 = 2 ⋅38081159.

It is a cyclic number.

It is not a de Polignac number, because 81326167 - 2³ = 81326159 is a prime.

It is a super-2 number, since 2×81326167² = 13227890877823778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81326107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3127917 + ... + 3127942.

It is an arithmetic number, because the mean of its divisors is an integer number (21895510).

Almost surely, 2^81326167 is an apocalyptic number.

81326167 is a deficient number, since it is larger than the sum of its proper divisors (6255873).

81326167 is a wasteful number, since it uses less digits than its factorization.

81326167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6255872.

The product of its digits is 12096, while the sum is 34.

The square root of 81326167 is about 9018.1021839409. The cubic root of 81326167 is about 433.2548515989.

The spelling of 81326167 in words is "eighty-one million, three hundred twenty-six thousand, one hundred sixty-seven".