1268863509 has 4 divisors (see below), whose sum is σ = 1691818016. Its totient is φ = 845909004.

The previous prime is 1268863469. The next prime is 1268863537. The reversal of 1268863509 is 9053688621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1268863509 - 2²¹ = 1266766357 is a prime.

It is a super-2 number, since 2×1268863509² = 3220029208943586162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268863549) 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, 211477249 + ... + 211477254.

It is an arithmetic number, because the mean of its divisors is an integer number (422954504).

Almost surely, 2^1268863509 is an apocalyptic number.

It is an amenable number.

1268863509 is a deficient number, since it is larger than the sum of its proper divisors (422954507).

1268863509 is an equidigital number, since it uses as much as digits as its factorization.

1268863509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422954506.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 1268863509 is about 35621.1104402993. The cubic root of 1268863509 is about 1082.6090068673.

The spelling of 1268863509 in words is "one billion, two hundred sixty-eight million, eight hundred sixty-three thousand, five hundred nine".