1280313999 has 16 divisors (see below), whose sum is σ = 1915180800. Its totient is φ = 845254008.

The previous prime is 1280313973. The next prime is 1280314019. The reversal of 1280313999 is 9993130821.

It is a happy number.

It is not a de Polignac number, because 1280313999 - 2⁵ = 1280313967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280313599) 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, 227409 + ... + 232970.

It is an arithmetic number, because the mean of its divisors is an integer number (119698800).

Almost surely, 2^1280313999 is an apocalyptic number.

1280313999 is a deficient number, since it is larger than the sum of its proper divisors (634866801).

1280313999 is a wasteful number, since it uses less digits than its factorization.

1280313999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460491 (or 460485 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1280313999 is about 35781.4756403366. The cubic root of 1280313999 is about 1085.8558231725.

The spelling of 1280313999 in words is "one billion, two hundred eighty million, three hundred thirteen thousand, nine hundred ninety-nine".