869637649 has 4 divisors (see below), whose sum is σ = 870994980. Its totient is φ = 868280320.

The previous prime is 869637623. The next prime is 869637653. The reversal of 869637649 is 946736968.

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 674337024 + 195300625 = 25968^2 + 13975^2 .

It is a cyclic number.

It is not a de Polignac number, because 869637649 - 2¹⁵ = 869604881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 869637593 and 869637602.

It is not an unprimeable number, because it can be changed into a prime (869637149) 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, 677704 + ... + 678985.

It is an arithmetic number, because the mean of its divisors is an integer number (217748745).

Almost surely, 2^869637649 is an apocalyptic number.

It is an amenable number.

869637649 is a deficient number, since it is larger than the sum of its proper divisors (1357331).

869637649 is a wasteful number, since it uses less digits than its factorization.

869637649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357330.

The product of its digits is 11757312, while the sum is 58.

The square root of 869637649 is about 29489.6193430841. The cubic root of 869637649 is about 954.5077181039.

The spelling of 869637649 in words is "eight hundred sixty-nine million, six hundred thirty-seven thousand, six hundred forty-nine".