864166291 has 4 divisors (see below), whose sum is σ = 864269784. Its totient is φ = 864062800.

The previous prime is 864166231. The next prime is 864166297. The reversal of 864166291 is 192661468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 864166291 - 2¹⁷ = 864035219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864166297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38005 + ... + 56326.

It is an arithmetic number, because the mean of its divisors is an integer number (216067446).

Almost surely, 2^864166291 is an apocalyptic number.

864166291 is a deficient number, since it is larger than the sum of its proper divisors (103493).

864166291 is an equidigital number, since it uses as much as digits as its factorization.

864166291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103492.

The product of its digits is 124416, while the sum is 43.

The square root of 864166291 is about 29396.7054446583. The cubic root of 864166291 is about 952.5017315455.

The spelling of 864166291 in words is "eight hundred sixty-four million, one hundred sixty-six thousand, two hundred ninety-one".