81977051 has 8 divisors (see below), whose sum is σ = 91131264. Its totient is φ = 73229760.

The previous prime is 81977041. The next prime is 81977053. The reversal of 81977051 is 15077918.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81977051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81976996 and 81977014.

It is not an unprimeable number, because it can be changed into a prime (81977053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101306 + ... + 102111.

It is an arithmetic number, because the mean of its divisors is an integer number (11391408).

Almost surely, 2^81977051 is an apocalyptic number.

81977051 is a deficient number, since it is larger than the sum of its proper divisors (9154213).

81977051 is a wasteful number, since it uses less digits than its factorization.

81977051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203461.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 81977051 is about 9054.1179029213. The cubic root of 81977051 is about 434.4076157280.

The spelling of 81977051 in words is "eighty-one million, nine hundred seventy-seven thousand, fifty-one".