85342181 has 2 divisors, whose sum is σ = 85342182. Its totient is φ = 85342180.

The previous prime is 85342171. The next prime is 85342207. The reversal of 85342181 is 18124358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 1985281 = 9130^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 85342181 - 2²² = 81147877 is a prime.

It is a super-2 number, since 2×85342181² = 14566575715673522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85342141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42671090 + 42671091.

It is an arithmetic number, because the mean of its divisors is an integer number (42671091).

Almost surely, 2^85342181 is an apocalyptic number.

It is an amenable number.

85342181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85342181 is an equidigital number, since it uses as much as digits as its factorization.

85342181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 85342181 is about 9238.0831886274. The cubic root of 85342181 is about 440.2721818016.

It can be divided in two parts, 853 and 42181, that added together give a palindrome (43034).

The spelling of 85342181 in words is "eighty-five million, three hundred forty-two thousand, one hundred eighty-one".