85840091 has 2 divisors, whose sum is σ = 85840092. Its totient is φ = 85840090.

The previous prime is 85840067. The next prime is 85840093. The reversal of 85840091 is 19004858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85840091 - 2²² = 81645787 is a prime.

Together with 85840093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85840093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920045 + 42920046.

It is an arithmetic number, because the mean of its divisors is an integer number (42920046).

Almost surely, 2^85840091 is an apocalyptic number.

85840091 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840091 is an equidigital number, since it uses as much as digits as its factorization.

85840091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 85840091 is about 9264.9927684807. The cubic root of 85840091 is about 441.1267454486.

The spelling of 85840091 in words is "eighty-five million, eight hundred forty thousand, ninety-one".