869575649 has 2 divisors, whose sum is σ = 869575650. Its totient is φ = 869575648.

The previous prime is 869575639. The next prime is 869575667. The reversal of 869575649 is 946575968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543123025 + 326452624 = 23305^2 + 18068^2 .

It is a cyclic number.

It is not a de Polignac number, because 869575649 - 2⁴ = 869575633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (869575639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434787824 + 434787825.

It is an arithmetic number, because the mean of its divisors is an integer number (434787825).

Almost surely, 2^869575649 is an apocalyptic number.

It is an amenable number.

869575649 is a deficient number, since it is larger than the sum of its proper divisors (1).

869575649 is an equidigital number, since it uses as much as digits as its factorization.

869575649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 59.

The square root of 869575649 is about 29488.5681069800. The cubic root of 869575649 is about 954.4850339875.

The spelling of 869575649 in words is "eight hundred sixty-nine million, five hundred seventy-five thousand, six hundred forty-nine".