80409181 has 2 divisors, whose sum is σ = 80409182. Its totient is φ = 80409180.

The previous prime is 80409157. The next prime is 80409193. The reversal of 80409181 is 18190408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80192025 + 217156 = 8955^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 80409181 - 2⁵ = 80409149 is a prime.

It is a super-2 number, since 2×80409181² = 12931272778181522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80409101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40204590 + 40204591.

It is an arithmetic number, because the mean of its divisors is an integer number (40204591).

Almost surely, 2^80409181 is an apocalyptic number.

It is an amenable number.

80409181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80409181 is an equidigital number, since it uses as much as digits as its factorization.

80409181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 80409181 is about 8967.1166491799. The cubic root of 80409181 is about 431.6203171879.

Adding to 80409181 its reverse (18190408), we get a palindrome (98599589).

The spelling of 80409181 in words is "eighty million, four hundred nine thousand, one hundred eighty-one".