81179077 has 16 divisors (see below), whose sum is σ = 97943040. Its totient is φ = 65728368.

The previous prime is 81179069. The next prime is 81179117. The reversal of 81179077 is 77097118.

It is a cyclic number.

It is not a de Polignac number, because 81179077 - 2³ = 81179069 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 (81179177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61458 + ... + 62764.

It is an arithmetic number, because the mean of its divisors is an integer number (6121440).

Almost surely, 2^81179077 is an apocalyptic number.

It is an amenable number.

81179077 is a deficient number, since it is larger than the sum of its proper divisors (16763963).

81179077 is a wasteful number, since it uses less digits than its factorization.

81179077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 81179077 is about 9009.9432295659. The cubic root of 81179077 is about 432.9934928538.

The spelling of 81179077 in words is "eighty-one million, one hundred seventy-nine thousand, seventy-seven".