1311888399 has 16 divisors (see below), whose sum is σ = 1811100000. Its totient is φ = 843687936.

The previous prime is 1311888337. The next prime is 1311888433. The reversal of 1311888399 is 9938881131.

It is a Cunningham number, because it is equal to 36220²-1.

It is not a de Polignac number, because 1311888399 - 2¹² = 1311884303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311883399) 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, 102627 + ... + 114699.

It is an arithmetic number, because the mean of its divisors is an integer number (113193750).

Almost surely, 2^1311888399 is an apocalyptic number.

1311888399 is a deficient number, since it is larger than the sum of its proper divisors (499211601).

1311888399 is a wasteful number, since it uses less digits than its factorization.

1311888399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354.

The product of its digits is 373248, while the sum is 51.

The square root of 1311888399 is about 36219.9999861955. Note that the first 4 decimals coincide. The cubic root of 1311888399 is about 1094.7096938964.

The spelling of 1311888399 in words is "one billion, three hundred eleven million, eight hundred eighty-eight thousand, three hundred ninety-nine".