85144019 has 2 divisors, whose sum is σ = 85144020. Its totient is φ = 85144018.

The previous prime is 85144013. The next prime is 85144027. The reversal of 85144019 is 91044158.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85144019 is a prime.

It is a super-2 number, since 2×85144019² = 14499007942944722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85144013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572009 + 42572010.

It is an arithmetic number, because the mean of its divisors is an integer number (42572010).

Almost surely, 2^85144019 is an apocalyptic number.

85144019 is a deficient number, since it is larger than the sum of its proper divisors (1).

85144019 is an equidigital number, since it uses as much as digits as its factorization.

85144019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 85144019 is about 9227.3516785695. The cubic root of 85144019 is about 439.9311514176.

The spelling of 85144019 in words is "eighty-five million, one hundred forty-four thousand, nineteen".