85781291 has 2 divisors, whose sum is σ = 85781292. Its totient is φ = 85781290.

The previous prime is 85781279. The next prime is 85781321. The reversal of 85781291 is 19218758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85781291 - 2¹⁰ = 85780267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85781791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42890645 + 42890646.

It is an arithmetic number, because the mean of its divisors is an integer number (42890646).

Almost surely, 2^85781291 is an apocalyptic number.

85781291 is a deficient number, since it is larger than the sum of its proper divisors (1).

85781291 is an equidigital number, since it uses as much as digits as its factorization.

85781291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 41.

The square root of 85781291 is about 9261.8189898097. The cubic root of 85781291 is about 441.0259992933.

The spelling of 85781291 in words is "eighty-five million, seven hundred eighty-one thousand, two hundred ninety-one".