1285659649 has 4 divisors (see below), whose sum is σ = 1295044164. Its totient is φ = 1276275136.

The previous prime is 1285659611. The next prime is 1285659653. The reversal of 1285659649 is 9469565821.

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 1088538049 + 197121600 = 32993^2 + 14040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285659649 - 2¹¹ = 1285657601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285659649.

It is not an unprimeable number, because it can be changed into a prime (1285659679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4692052 + ... + 4692325.

It is an arithmetic number, because the mean of its divisors is an integer number (323761041).

Almost surely, 2^1285659649 is an apocalyptic number.

It is an amenable number.

1285659649 is a deficient number, since it is larger than the sum of its proper divisors (9384515).

1285659649 is an equidigital number, since it uses as much as digits as its factorization.

1285659649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9384514.

The product of its digits is 4665600, while the sum is 55.

The square root of 1285659649 is about 35856.0963993573. The cubic root of 1285659649 is about 1087.3649699612.

The spelling of 1285659649 in words is "one billion, two hundred eighty-five million, six hundred fifty-nine thousand, six hundred forty-nine".