1268649409 has 8 divisors (see below), whose sum is σ = 1279357832. Its totient is φ = 1257984000.

The previous prime is 1268649353. The next prime is 1268649413. The reversal of 1268649409 is 9049468621.

It can be written as a sum of positive squares in 4 ways, for example, as 75637809 + 1193011600 = 8697^2 + 34540^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1268649409 - 2⁷ = 1268649281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268649419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49909 + ... + 70909.

It is an arithmetic number, because the mean of its divisors is an integer number (159919729).

Almost surely, 2^1268649409 is an apocalyptic number.

It is an amenable number.

1268649409 is a deficient number, since it is larger than the sum of its proper divisors (10708423).

1268649409 is a wasteful number, since it uses less digits than its factorization.

1268649409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21507.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 1268649409 is about 35618.1050731226. The cubic root of 1268649409 is about 1082.5481125776.

The spelling of 1268649409 in words is "one billion, two hundred sixty-eight million, six hundred forty-nine thousand, four hundred nine".