1327631999 has 4 divisors (see below), whose sum is σ = 1349396520. Its totient is φ = 1305867480.

The previous prime is 1327631969. The next prime is 1327632037. The reversal of 1327631999 is 9991367231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9991367231 = 23021 ⋅434011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1327631999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327631939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10882169 + ... + 10882290.

It is an arithmetic number, because the mean of its divisors is an integer number (337349130).

Almost surely, 2^1327631999 is an apocalyptic number.

1327631999 is a deficient number, since it is larger than the sum of its proper divisors (21764521).

1327631999 is an equidigital number, since it uses as much as digits as its factorization.

1327631999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21764520.

The product of its digits is 551124, while the sum is 50.

The square root of 1327631999 is about 36436.6847970558. The cubic root of 1327631999 is about 1099.0713923335.

The spelling of 1327631999 in words is "one billion, three hundred twenty-seven million, six hundred thirty-one thousand, nine hundred ninety-nine".