85526509 has 4 divisors (see below), whose sum is σ = 85580704. Its totient is φ = 85472316.

The previous prime is 85526503. The next prime is 85526513. The reversal of 85526509 is 90562558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85526509 - 2³ = 85526501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85526501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24657 + ... + 27910.

It is an arithmetic number, because the mean of its divisors is an integer number (21395176).

Almost surely, 2^85526509 is an apocalyptic number.

It is an amenable number.

85526509 is a deficient number, since it is larger than the sum of its proper divisors (54195).

85526509 is a wasteful number, since it uses less digits than its factorization.

85526509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54194.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 85526509 is about 9248.0543359130. The cubic root of 85526509 is about 440.5889307295.

The spelling of 85526509 in words is "eighty-five million, five hundred twenty-six thousand, five hundred nine".