85271819 has 2 divisors, whose sum is σ = 85271820. Its totient is φ = 85271818.

The previous prime is 85271807. The next prime is 85271821. The reversal of 85271819 is 91817258.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85271819 is a prime.

It is a super-2 number, since 2×85271819² = 14542566231137522, which contains 22 as substring.

Together with 85271821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85276819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42635909 + 42635910.

It is an arithmetic number, because the mean of its divisors is an integer number (42635910).

Almost surely, 2^85271819 is an apocalyptic number.

85271819 is a deficient number, since it is larger than the sum of its proper divisors (1).

85271819 is an equidigital number, since it uses as much as digits as its factorization.

85271819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 41.

The square root of 85271819 is about 9234.2741458114. The cubic root of 85271819 is about 440.1511515819.

The spelling of 85271819 in words is "eighty-five million, two hundred seventy-one thousand, eight hundred nineteen".