85915019 has 2 divisors, whose sum is σ = 85915020. Its totient is φ = 85915018.

The previous prime is 85915009. The next prime is 85915031. The reversal of 85915019 is 91051958.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85915019 is a prime.

It is a super-2 number, since 2×85915019² = 14762780979540722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85915009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42957509 + 42957510.

It is an arithmetic number, because the mean of its divisors is an integer number (42957510).

Almost surely, 2^85915019 is an apocalyptic number.

85915019 is a deficient number, since it is larger than the sum of its proper divisors (1).

85915019 is an equidigital number, since it uses as much as digits as its factorization.

85915019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 85915019 is about 9269.0354945917. The cubic root of 85915019 is about 441.2550581909.

The spelling of 85915019 in words is "eighty-five million, nine hundred fifteen thousand, nineteen".