85438019 has 2 divisors, whose sum is σ = 85438020. Its totient is φ = 85438018.

The previous prime is 85438013. The next prime is 85438027. The reversal of 85438019 is 91083458.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85438019 is a prime.

It is a super-2 number, since 2×85438019² = 14599310181288722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85438013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719009 + 42719010.

It is an arithmetic number, because the mean of its divisors is an integer number (42719010).

Almost surely, 2^85438019 is an apocalyptic number.

85438019 is a deficient number, since it is larger than the sum of its proper divisors (1).

85438019 is an equidigital number, since it uses as much as digits as its factorization.

85438019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 85438019 is about 9243.2688481943. The cubic root of 85438019 is about 440.4369265191.

The spelling of 85438019 in words is "eighty-five million, four hundred thirty-eight thousand, nineteen".