1268895509 has 16 divisors (see below), whose sum is σ = 1474572288. Its totient is φ = 1069466112.

The previous prime is 1268895499. The next prime is 1268895541. The reversal of 1268895509 is 9055988621.

It is a cyclic number.

It is not a de Polignac number, because 1268895509 - 2⁸ = 1268895253 is a prime.

It is a super-2 number, since 2×1268895509² = 3220191625520738162, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268895569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100652 + ... + 112554.

It is an arithmetic number, because the mean of its divisors is an integer number (92160768).

Almost surely, 2^1268895509 is an apocalyptic number.

It is an amenable number.

1268895509 is a deficient number, since it is larger than the sum of its proper divisors (205676779).

1268895509 is a wasteful number, since it uses less digits than its factorization.

1268895509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12164.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The square root of 1268895509 is about 35621.5596093153. The cubic root of 1268895509 is about 1082.6181077141.

The spelling of 1268895509 in words is "one billion, two hundred sixty-eight million, eight hundred ninety-five thousand, five hundred nine".