85867891 has 2 divisors, whose sum is σ = 85867892. Its totient is φ = 85867890.

The previous prime is 85867883. The next prime is 85867913. The reversal of 85867891 is 19876858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85867891 - 2³ = 85867883 is a prime.

It is not a weakly prime, because it can be changed into another prime (85867801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42933945 + 42933946.

It is an arithmetic number, because the mean of its divisors is an integer number (42933946).

Almost surely, 2^85867891 is an apocalyptic number.

85867891 is a deficient number, since it is larger than the sum of its proper divisors (1).

85867891 is an equidigital number, since it uses as much as digits as its factorization.

85867891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 52.

The square root of 85867891 is about 9266.4929180354. The cubic root of 85867891 is about 441.1743611169.

The spelling of 85867891 in words is "eighty-five million, eight hundred sixty-seven thousand, eight hundred ninety-one".