85509423 has 12 divisors (see below), whose sum is σ = 128884080. Its totient is φ = 54527616.

The previous prime is 85509421. The next prime is 85509427. The reversal of 85509423 is 32490558.

It is not a de Polignac number, because 85509423 - 2¹ = 85509421 is a prime.

It is a super-2 number, since 2×85509423² = 14623722843585858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85509421) 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 in 11 ways as a sum of consecutive naturals, for example, 206338 + ... + 206751.

It is an arithmetic number, because the mean of its divisors is an integer number (10740340).

Almost surely, 2^85509423 is an apocalyptic number.

85509423 is a deficient number, since it is larger than the sum of its proper divisors (43374657).

85509423 is a wasteful number, since it uses less digits than its factorization.

85509423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413118 (or 413115 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 85509423 is about 9247.1305278989. The cubic root of 85509423 is about 440.5595893245.

The spelling of 85509423 in words is "eighty-five million, five hundred nine thousand, four hundred twenty-three".