85917909 has 16 divisors (see below), whose sum is σ = 142824960. Its totient is φ = 44632560.

The previous prime is 85917907. The next prime is 85917947. The reversal of 85917909 is 90971958.

It is not a de Polignac number, because 85917909 - 2¹ = 85917907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85917901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185739 + ... + 186200.

It is an arithmetic number, because the mean of its divisors is an integer number (8926560).

Almost surely, 2^85917909 is an apocalyptic number.

It is an amenable number.

85917909 is a deficient number, since it is larger than the sum of its proper divisors (56907051).

85917909 is a wasteful number, since it uses less digits than its factorization.

85917909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371960.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 85917909 is about 9269.1913886811. The cubic root of 85917909 is about 441.2600057652.

The spelling of 85917909 in words is "eighty-five million, nine hundred seventeen thousand, nine hundred nine".