185908081 has 2 divisors, whose sum is σ = 185908082. Its totient is φ = 185908080.

The previous prime is 185908069. The next prime is 185908097. The reversal of 185908081 is 180809581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170067681 + 15840400 = 13041^2 + 3980^2 .

It is an emirp because it is prime and its reverse (180809581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185908081 - 2²³ = 177519473 is a prime.

It is a super-2 number, since 2×185908081² = 69123629162205122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (185908181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92954040 + 92954041.

It is an arithmetic number, because the mean of its divisors is an integer number (92954041).

Almost surely, 2^185908081 is an apocalyptic number.

It is an amenable number.

185908081 is a deficient number, since it is larger than the sum of its proper divisors (1).

185908081 is an equidigital number, since it uses as much as digits as its factorization.

185908081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 185908081 is about 13634.8113664986. The cubic root of 185908081 is about 570.7326999021.

The spelling of 185908081 in words is "one hundred eighty-five million, nine hundred eight thousand, eighty-one".