869143969 has 4 divisors (see below), whose sum is σ = 874977300. Its totient is φ = 863310640.

The previous prime is 869143903. The next prime is 869143981. The reversal of 869143969 is 969341968.

869143969 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 410670225 + 458473744 = 20265^2 + 21412^2 .

It is a cyclic number.

It is not a de Polignac number, because 869143969 - 2¹³ = 869135777 is a prime.

It is a super-2 number, since 2×869143969² = 1510822477698145922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869143469) 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, 2916442 + ... + 2916739.

It is an arithmetic number, because the mean of its divisors is an integer number (218744325).

Almost surely, 2^869143969 is an apocalyptic number.

It is an amenable number.

869143969 is a deficient number, since it is larger than the sum of its proper divisors (5833331).

869143969 is a wasteful number, since it uses less digits than its factorization.

869143969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833330.

The product of its digits is 2519424, while the sum is 55.

The square root of 869143969 is about 29481.2477517489. The cubic root of 869143969 is about 954.3270641011.

The spelling of 869143969 in words is "eight hundred sixty-nine million, one hundred forty-three thousand, nine hundred sixty-nine".