1255011999 has 16 divisors (see below), whose sum is σ = 1689586272. Its totient is φ = 828592128.

The previous prime is 1255011983. The next prime is 1255012123. The reversal of 1255011999 is 9991105521.

It is not a de Polignac number, because 1255011999 - 2⁴ = 1255011983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255011999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255011929) 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, 143167 + ... + 151679.

It is an arithmetic number, because the mean of its divisors is an integer number (105599142).

Almost surely, 2^1255011999 is an apocalyptic number.

1255011999 is a deficient number, since it is larger than the sum of its proper divisors (434574273).

1255011999 is a wasteful number, since it uses less digits than its factorization.

1255011999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8986.

The product of its (nonzero) digits is 36450, while the sum is 42.

The square root of 1255011999 is about 35426.1485205491. The cubic root of 1255011999 is about 1078.6551616369.

The spelling of 1255011999 in words is "one billion, two hundred fifty-five million, eleven thousand, nine hundred ninety-nine".