80977561 has 8 divisors (see below), whose sum is σ = 94063424. Its totient is φ = 68271120.

The previous prime is 80977553. The next prime is 80977577. The reversal of 80977561 is 16577908.

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 80977561 - 2³ = 80977553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80977361) 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, 94395 + ... + 95248.

It is an arithmetic number, because the mean of its divisors is an integer number (11757928).

Almost surely, 2^80977561 is an apocalyptic number.

It is an amenable number.

80977561 is a deficient number, since it is larger than the sum of its proper divisors (13085863).

80977561 is a wasteful number, since it uses less digits than its factorization.

80977561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189711.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 80977561 is about 8998.7533025414. The cubic root of 80977561 is about 432.6349135280.

The spelling of 80977561 in words is "eighty million, nine hundred seventy-seven thousand, five hundred sixty-one".