85144117 has 2 divisors, whose sum is σ = 85144118. Its totient is φ = 85144116.

The previous prime is 85144097. The next prime is 85144121. The reversal of 85144117 is 71144158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81108036 + 4036081 = 9006^2 + 2009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85144117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85844117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572058 + 42572059.

It is an arithmetic number, because the mean of its divisors is an integer number (42572059).

Almost surely, 2^85144117 is an apocalyptic number.

It is an amenable number.

85144117 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144117 is an equidigital number, since it uses as much as digits as its factorization.

85144117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 31.

The square root of 85144117 is about 9227.3569888674. The cubic root of 85144117 is about 439.9313202032.

The spelling of 85144117 in words is "eighty-five million, one hundred forty-four thousand, one hundred seventeen".