85852509 has 4 divisors (see below), whose sum is σ = 114470016. Its totient is φ = 57235004.

The previous prime is 85852471. The next prime is 85852511. The reversal of 85852509 is 90525858.

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 85852509 - 2⁸ = 85852253 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85852519) 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, 14308749 + ... + 14308754.

It is an arithmetic number, because the mean of its divisors is an integer number (28617504).

Almost surely, 2^85852509 is an apocalyptic number.

It is an amenable number.

85852509 is a deficient number, since it is larger than the sum of its proper divisors (28617507).

85852509 is a wasteful number, since it uses less digits than its factorization.

85852509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28617506.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 85852509 is about 9265.6629012716. The cubic root of 85852509 is about 441.1480161925.

The spelling of 85852509 in words is "eighty-five million, eight hundred fifty-two thousand, five hundred nine".