85144181 has 2 divisors, whose sum is σ = 85144182. Its totient is φ = 85144180.

The previous prime is 85144153. The next prime is 85144223. The reversal of 85144181 is 18144158.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81180100 + 3964081 = 9010^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 85144181 - 2⁶ = 85144117 is a prime.

It is a super-2 number, since 2×85144181² = 14499063116321522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85144121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572090 + 42572091.

It is an arithmetic number, because the mean of its divisors is an integer number (42572091).

Almost surely, 2^85144181 is an apocalyptic number.

It is an amenable number.

85144181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144181 is an equidigital number, since it uses as much as digits as its factorization.

85144181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 32.

The square root of 85144181 is about 9227.3604568154. The cubic root of 85144181 is about 439.9314304304.

The spelling of 85144181 in words is "eighty-five million, one hundred forty-four thousand, one hundred eighty-one".