80616981 has 16 divisors (see below), whose sum is σ = 113699840. Its totient is φ = 50667120.

The previous prime is 80616971. The next prime is 80616989. The reversal of 80616981 is 18961608.

It is not a de Polignac number, because 80616981 - 2⁶ = 80616917 is a prime.

It is a super-2 number, since 2×80616981² = 12998195251108722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80616989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8676 + ... + 15378.

It is an arithmetic number, because the mean of its divisors is an integer number (7106240).

Almost surely, 2^80616981 is an apocalyptic number.

It is an amenable number.

80616981 is a deficient number, since it is larger than the sum of its proper divisors (33082859).

80616981 is a wasteful number, since it uses less digits than its factorization.

80616981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 80616981 is about 8978.6959520857. The cubic root of 80616981 is about 431.9918069005.

The spelling of 80616981 in words is "eighty million, six hundred sixteen thousand, nine hundred eighty-one".