81176121 has 16 divisors (see below), whose sum is σ = 129512320. Its totient is φ = 49954320.

The previous prime is 81176089. The next prime is 81176129. The reversal of 81176121 is 12167118.

It is not a de Polignac number, because 81176121 - 2⁵ = 81176089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81176129) 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, 115285 + ... + 115986.

It is an arithmetic number, because the mean of its divisors is an integer number (8094520).

Almost surely, 2^81176121 is an apocalyptic number.

It is an amenable number.

81176121 is a deficient number, since it is larger than the sum of its proper divisors (48336199).

81176121 is a wasteful number, since it uses less digits than its factorization.

81176121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231293 (or 231287 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 81176121 is about 9009.7791870833. The cubic root of 81176121 is about 432.9882372126.

The spelling of 81176121 in words is "eighty-one million, one hundred seventy-six thousand, one hundred twenty-one".