85993181 has 2 divisors, whose sum is σ = 85993182. Its totient is φ = 85993180.

The previous prime is 85993177. The next prime is 85993199. The reversal of 85993181 is 18139958.

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., 53787556 + 32205625 = 7334^2 + 5675^2 .

It is a cyclic number.

It is not a de Polignac number, because 85993181 - 2² = 85993177 is a prime.

It is a super-2 number, since 2×85993181² = 14789654356997522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85993111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42996590 + 42996591.

It is an arithmetic number, because the mean of its divisors is an integer number (42996591).

Almost surely, 2^85993181 is an apocalyptic number.

It is an amenable number.

85993181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85993181 is an equidigital number, since it uses as much as digits as its factorization.

85993181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 44.

The square root of 85993181 is about 9273.2508323673. The cubic root of 85993181 is about 441.3888296181.

The spelling of 85993181 in words is "eighty-five million, nine hundred ninety-three thousand, one hundred eighty-one".