80838181 has 2 divisors, whose sum is σ = 80838182. Its totient is φ = 80838180.

The previous prime is 80838157. The next prime is 80838193. The reversal of 80838181 is 18183808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80838081 + 100 = 8991^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80838181 is a prime.

It is a super-2 number, since 2×80838181² = 13069623014777522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80838181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80838781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40419090 + 40419091.

It is an arithmetic number, because the mean of its divisors is an integer number (40419091).

Almost surely, 2^80838181 is an apocalyptic number.

It is an amenable number.

80838181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80838181 is an equidigital number, since it uses as much as digits as its factorization.

80838181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 80838181 is about 8991.0055611150. The cubic root of 80838181 is about 432.3865513749.

The spelling of 80838181 in words is "eighty million, eight hundred thirty-eight thousand, one hundred eighty-one".