864841091 has 2 divisors, whose sum is σ = 864841092. Its totient is φ = 864841090.

The previous prime is 864841049. The next prime is 864841123. The reversal of 864841091 is 190148468.

864841091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864841091 - 2²⁶ = 797732227 is a prime.

It is a super-2 number, since 2×864841091² = 1495900225364140562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (864841291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432420545 + 432420546.

It is an arithmetic number, because the mean of its divisors is an integer number (432420546).

Almost surely, 2^864841091 is an apocalyptic number.

864841091 is a deficient number, since it is larger than the sum of its proper divisors (1).

864841091 is an equidigital number, since it uses as much as digits as its factorization.

864841091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 864841091 is about 29408.1806815723. The cubic root of 864841091 is about 952.7495931539.

The spelling of 864841091 in words is "eight hundred sixty-four million, eight hundred forty-one thousand, ninety-one".