85809523 has 8 divisors (see below), whose sum is σ = 90970992. Its totient is φ = 80660736.

The previous prime is 85809517. The next prime is 85809533. The reversal of 85809523 is 32590858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85809523 - 2²¹ = 83712371 is a prime.

It is a Duffinian number.

85809523 is a modest number, since divided by 809523 gives 85 as remainder.

It is not an unprimeable number, because it can be changed into a prime (85809533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13236 + ... + 18622.

It is an arithmetic number, because the mean of its divisors is an integer number (11371374).

Almost surely, 2^85809523 is an apocalyptic number.

85809523 is a deficient number, since it is larger than the sum of its proper divisors (5161469).

85809523 is a wasteful number, since it uses less digits than its factorization.

85809523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 85809523 is about 9263.3429710877. The cubic root of 85809523 is about 441.0743768986.

The spelling of 85809523 in words is "eighty-five million, eight hundred nine thousand, five hundred twenty-three".