85691309 has 4 divisors (see below), whose sum is σ = 93481440. Its totient is φ = 77901180.

The previous prime is 85691279. The next prime is 85691323. The reversal of 85691309 is 90319658.

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 85691309 - 2²⁴ = 68914093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85691369) 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, 3895049 + ... + 3895070.

It is an arithmetic number, because the mean of its divisors is an integer number (23370360).

Almost surely, 2^85691309 is an apocalyptic number.

It is an amenable number.

85691309 is a deficient number, since it is larger than the sum of its proper divisors (7790131).

85691309 is a wasteful number, since it uses less digits than its factorization.

85691309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7790130.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 85691309 is about 9256.9600301611. The cubic root of 85691309 is about 440.8717376627.

The spelling of 85691309 in words is "eighty-five million, six hundred ninety-one thousand, three hundred nine".