869613649 has 4 divisors (see below), whose sum is σ = 890823780. Its totient is φ = 848403520.

The previous prime is 869613629. The next prime is 869613671. The reversal of 869613649 is 946316968.

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 363588624 + 506025025 = 19068^2 + 22495^2 .

It is a cyclic number.

It is not a de Polignac number, because 869613649 - 2¹¹ = 869611601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 869613596 and 869613605.

It is not an unprimeable number, because it can be changed into a prime (869613629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10605004 + ... + 10605085.

It is an arithmetic number, because the mean of its divisors is an integer number (222705945).

Almost surely, 2^869613649 is an apocalyptic number.

It is an amenable number.

869613649 is a deficient number, since it is larger than the sum of its proper divisors (21210131).

869613649 is a wasteful number, since it uses less digits than its factorization.

869613649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21210130.

The product of its digits is 1679616, while the sum is 52.

The square root of 869613649 is about 29489.2124174248. The cubic root of 869613649 is about 954.4989372835.

The spelling of 869613649 in words is "eight hundred sixty-nine million, six hundred thirteen thousand, six hundred forty-nine".