85170691 has 2 divisors, whose sum is σ = 85170692. Its totient is φ = 85170690.

The previous prime is 85170661. The next prime is 85170727. The reversal of 85170691 is 19607158.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85170691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85170691.

It is not a weakly prime, because it can be changed into another prime (85170641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585345 + 42585346.

It is an arithmetic number, because the mean of its divisors is an integer number (42585346).

Almost surely, 2^85170691 is an apocalyptic number.

85170691 is a deficient number, since it is larger than the sum of its proper divisors (1).

85170691 is an equidigital number, since it uses as much as digits as its factorization.

85170691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 85170691 is about 9228.7968338240. The cubic root of 85170691 is about 439.9770838616.

The spelling of 85170691 in words is "eighty-five million, one hundred seventy thousand, six hundred ninety-one".