85408181 has 2 divisors, whose sum is σ = 85408182. Its totient is φ = 85408180.

The previous prime is 85408171. The next prime is 85408199. The reversal of 85408181 is 18180458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85396081 + 12100 = 9241^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85408181 is a prime.

It is a super-2 number, since 2×85408181² = 14589114763457522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85408111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42704090 + 42704091.

It is an arithmetic number, because the mean of its divisors is an integer number (42704091).

Almost surely, 2^85408181 is an apocalyptic number.

It is an amenable number.

85408181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85408181 is an equidigital number, since it uses as much as digits as its factorization.

85408181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 85408181 is about 9241.6546678612. The cubic root of 85408181 is about 440.3856484607.

The spelling of 85408181 in words is "eighty-five million, four hundred eight thousand, one hundred eighty-one".