85781959 has 2 divisors, whose sum is σ = 85781960. Its totient is φ = 85781958.

The previous prime is 85781957. The next prime is 85781977. The reversal of 85781959 is 95918758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85781959 - 2¹ = 85781957 is a prime.

Together with 85781957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85781953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42890979 + 42890980.

It is an arithmetic number, because the mean of its divisors is an integer number (42890980).

Almost surely, 2^85781959 is an apocalyptic number.

85781959 is a deficient number, since it is larger than the sum of its proper divisors (1).

85781959 is an equidigital number, since it uses as much as digits as its factorization.

85781959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 52.

The square root of 85781959 is about 9261.8550517701. The cubic root of 85781959 is about 441.0271440830.

The spelling of 85781959 in words is "eighty-five million, seven hundred eighty-one thousand, nine hundred fifty-nine".