85474819 has 2 divisors, whose sum is σ = 85474820. Its totient is φ = 85474818.

The previous prime is 85474817. The next prime is 85474891. The reversal of 85474819 is 91847458.

Together with next prime (85474891) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85474819 - 2¹ = 85474817 is a prime.

It is a super-2 number, since 2×85474819² = 14611889366165522, which contains 22 as substring.

Together with 85474817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85474817) 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, 42737409 + 42737410.

It is an arithmetic number, because the mean of its divisors is an integer number (42737410).

Almost surely, 2^85474819 is an apocalyptic number.

85474819 is a deficient number, since it is larger than the sum of its proper divisors (1).

85474819 is an equidigital number, since it uses as much as digits as its factorization.

85474819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 85474819 is about 9245.2592716484. The cubic root of 85474819 is about 440.5001526745.

It can be divided in two parts, 8547 and 4819, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 85474819 in words is "eighty-five million, four hundred seventy-four thousand, eight hundred nineteen".