869599649 has 2 divisors, whose sum is σ = 869599650. Its totient is φ = 869599648.

The previous prime is 869599603. The next prime is 869599667. The reversal of 869599649 is 946995968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673039249 + 196560400 = 25943^2 + 14020^2 .

It is a cyclic number.

It is not a de Polignac number, because 869599649 - 2²⁴ = 852822433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869599669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434799824 + 434799825.

It is an arithmetic number, because the mean of its divisors is an integer number (434799825).

Almost surely, 2^869599649 is an apocalyptic number.

It is an amenable number.

869599649 is a deficient number, since it is larger than the sum of its proper divisors (1).

869599649 is an equidigital number, since it uses as much as digits as its factorization.

869599649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37791360, while the sum is 65.

The square root of 869599649 is about 29488.9750415304. The cubic root of 869599649 is about 954.4938150636.

The spelling of 869599649 in words is "eight hundred sixty-nine million, five hundred ninety-nine thousand, six hundred forty-nine".