81177092 has 24 divisors (see below), whose sum is σ = 144907392. Its totient is φ = 39780000.

The previous prime is 81177073. The next prime is 81177113. The reversal of 81177092 is 29077118.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107717 + ... + 108467.

It is an arithmetic number, because the mean of its divisors is an integer number (6037808).

Almost surely, 2^81177092 is an apocalyptic number.

It is an amenable number.

81177092 is a deficient number, since it is larger than the sum of its proper divisors (63730300).

81177092 is a wasteful number, since it uses less digits than its factorization.

81177092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 81177092 is about 9009.8330728155. The cubic root of 81177092 is about 432.9899636230.

The spelling of 81177092 in words is "eighty-one million, one hundred seventy-seven thousand, ninety-two".