81167051 has 4 divisors (see below), whose sum is σ = 92762352. Its totient is φ = 69571752.

The previous prime is 81167039. The next prime is 81167057. The reversal of 81167051 is 15076118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81167051 - 2²² = 76972747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81167057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5797640 + ... + 5797653.

It is an arithmetic number, because the mean of its divisors is an integer number (23190588).

Almost surely, 2^81167051 is an apocalyptic number.

81167051 is a deficient number, since it is larger than the sum of its proper divisors (11595301).

81167051 is a wasteful number, since it uses less digits than its factorization.

81167051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11595300.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 81167051 is about 9009.2758310532. The cubic root of 81167051 is about 432.9721103453.

The spelling of 81167051 in words is "eighty-one million, one hundred sixty-seven thousand, fifty-one".