85618019 has 2 divisors, whose sum is σ = 85618020. Its totient is φ = 85618018.

The previous prime is 85617991. The next prime is 85618021. The reversal of 85618019 is 91081658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85618019 is a prime.

It is a super-2 number, since 2×85618019² = 14660890354968722, which contains 22 as substring.

Together with 85618021, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4977551 and since 85618019 and 4977551 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85612019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42809009 + 42809010.

It is an arithmetic number, because the mean of its divisors is an integer number (42809010).

Almost surely, 2^85618019 is an apocalyptic number.

85618019 is a deficient number, since it is larger than the sum of its proper divisors (1).

85618019 is an equidigital number, since it uses as much as digits as its factorization.

85618019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 85618019 is about 9253.0005403653. Note that the first 3 decimals coincide. The cubic root of 85618019 is about 440.7460123268.

The spelling of 85618019 in words is "eighty-five million, six hundred eighteen thousand, nineteen".