85951181 has 2 divisors, whose sum is σ = 85951182. Its totient is φ = 85951180.

The previous prime is 85951153. The next prime is 85951183. The reversal of 85951181 is 18115958.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 26522500 = 7709^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 85951181 - 2¹⁰ = 85950157 is a prime.

It is a super-2 number, since 2×85951181² = 14775211030589522, which contains 22 as substring.

Together with 85951183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85951183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42975590 + 42975591.

It is an arithmetic number, because the mean of its divisors is an integer number (42975591).

Almost surely, 2^85951181 is an apocalyptic number.

It is an amenable number.

85951181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85951181 is an equidigital number, since it uses as much as digits as its factorization.

85951181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 38.

The square root of 85951181 is about 9270.9859777696. The cubic root of 85951181 is about 441.3169582226.

The spelling of 85951181 in words is "eighty-five million, nine hundred fifty-one thousand, one hundred eighty-one".