85897181 has 2 divisors, whose sum is σ = 85897182. Its totient is φ = 85897180.

The previous prime is 85897169. The next prime is 85897261. The reversal of 85897181 is 18179858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85729081 + 168100 = 9259^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 85897181 - 2¹⁸ = 85635037 is a prime.

It is a super-2 number, since 2×85897181² = 14756651407493522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85897121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42948590 + 42948591.

It is an arithmetic number, because the mean of its divisors is an integer number (42948591).

Almost surely, 2^85897181 is an apocalyptic number.

It is an amenable number.

85897181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85897181 is an equidigital number, since it uses as much as digits as its factorization.

85897181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 47.

The square root of 85897181 is about 9268.0732086017. The cubic root of 85897181 is about 441.2245177312.

The spelling of 85897181 in words is "eighty-five million, eight hundred ninety-seven thousand, one hundred eighty-one".