864649469 has 4 divisors (see below), whose sum is σ = 864890844. Its totient is φ = 864408096.

The previous prime is 864649439. The next prime is 864649477. The reversal of 864649469 is 964946468.

864649469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 398521369 + 466128100 = 19963^2 + 21590^2 .

It is a cyclic number.

It is not a de Polignac number, because 864649469 - 2²⁰ = 863600893 is a prime.

It is a super-2 number, since 2×864649469² = 1495237408483963922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864649439) 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, 115232 + ... + 122505.

It is an arithmetic number, because the mean of its divisors is an integer number (216222711).

Almost surely, 2^864649469 is an apocalyptic number.

It is an amenable number.

864649469 is a deficient number, since it is larger than the sum of its proper divisors (241375).

864649469 is a wasteful number, since it uses less digits than its factorization.

864649469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241374.

The product of its digits is 8957952, while the sum is 56.

The square root of 864649469 is about 29404.9225300799. The cubic root of 864649469 is about 952.6792213558.

The spelling of 864649469 in words is "eight hundred sixty-four million, six hundred forty-nine thousand, four hundred sixty-nine".