869544869 has 2 divisors, whose sum is σ = 869544870. Its totient is φ = 869544868.

The previous prime is 869544859. The next prime is 869544901. The reversal of 869544869 is 968445968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798345025 + 71199844 = 28255^2 + 8438^2 .

It is a cyclic number.

It is not a de Polignac number, because 869544869 - 2²⁴ = 852767653 is a prime.

It is a super-2 number, since 2×869544869² = 1512216558408454322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869544859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434772434 + 434772435.

It is an arithmetic number, because the mean of its divisors is an integer number (434772435).

Almost surely, 2^869544869 is an apocalyptic number.

It is an amenable number.

869544869 is a deficient number, since it is larger than the sum of its proper divisors (1).

869544869 is an equidigital number, since it uses as much as digits as its factorization.

869544869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 59.

The square root of 869544869 is about 29488.0462051998. The cubic root of 869544869 is about 954.4737720208.

The spelling of 869544869 in words is "eight hundred sixty-nine million, five hundred forty-four thousand, eight hundred sixty-nine".