1280989089 has 12 divisors (see below), whose sum is σ = 1889686656. Its totient is φ = 835822392.

The previous prime is 1280989079. The next prime is 1280989109. The reversal of 1280989089 is 9809890821.

It is a happy number.

It is not a de Polignac number, because 1280989089 - 2²³ = 1272600481 is a prime.

It is a super-2 number, since 2×1280989089² = 3281866092274099842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1280989009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1513749 + ... + 1514594.

It is an arithmetic number, because the mean of its divisors is an integer number (157473888).

Almost surely, 2^1280989089 is an apocalyptic number.

It is an amenable number.

1280989089 is a deficient number, since it is larger than the sum of its proper divisors (608697567).

1280989089 is a wasteful number, since it uses less digits than its factorization.

1280989089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028396 (or 3028393 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 1280989089 is about 35790.9079096913. The cubic root of 1280989089 is about 1086.0466413634.

The spelling of 1280989089 in words is "one billion, two hundred eighty million, nine hundred eighty-nine thousand, eighty-nine".