80994181 has 2 divisors, whose sum is σ = 80994182. Its totient is φ = 80994180.

The previous prime is 80994149. The next prime is 80994191. The reversal of 80994181 is 18149908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80550625 + 443556 = 8975^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 80994181 - 2⁵ = 80994149 is a prime.

It is a super-2 number, since 2×80994181² = 13120114711721522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80994101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40497090 + 40497091.

It is an arithmetic number, because the mean of its divisors is an integer number (40497091).

Almost surely, 2^80994181 is an apocalyptic number.

It is an amenable number.

80994181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80994181 is an equidigital number, since it uses as much as digits as its factorization.

80994181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 80994181 is about 8999.6767164160. The cubic root of 80994181 is about 432.6645097944.

The spelling of 80994181 in words is "eighty million, nine hundred ninety-four thousand, one hundred eighty-one".