81120977 has 8 divisors (see below), whose sum is σ = 96740736. Its totient is φ = 66508992.

The previous prime is 81120973. The next prime is 81120989. The reversal of 81120977 is 77902118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81120977 - 2² = 81120973 is a prime.

It is a super-2 number, since 2×81120977² = 13161225818869058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81120971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251768 + ... + 252089.

It is an arithmetic number, because the mean of its divisors is an integer number (12092592).

Almost surely, 2^81120977 is an apocalyptic number.

It is an amenable number.

81120977 is a deficient number, since it is larger than the sum of its proper divisors (15619759).

81120977 is a wasteful number, since it uses less digits than its factorization.

81120977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503887.

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

The square root of 81120977 is about 9006.7184368115. The cubic root of 81120977 is about 432.8901701469.

The spelling of 81120977 in words is "eighty-one million, one hundred twenty thousand, nine hundred seventy-seven".