1331200999 has 2 divisors, whose sum is σ = 1331201000. Its totient is φ = 1331200998.

The previous prime is 1331200991. The next prime is 1331201021. The reversal of 1331200999 is 9990021331.

It is a weak prime.

It is an emirp because it is prime and its reverse (9990021331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331200999 - 2³ = 1331200991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331200991) 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 as a sum of consecutive naturals, namely, 665600499 + 665600500.

It is an arithmetic number, because the mean of its divisors is an integer number (665600500).

Almost surely, 2^1331200999 is an apocalyptic number.

1331200999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331200999 is an equidigital number, since it uses as much as digits as its factorization.

1331200999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 1331200999 is about 36485.6272934974. The cubic root of 1331200999 is about 1100.0553688383.

The spelling of 1331200999 in words is "one billion, three hundred thirty-one million, two hundred thousand, nine hundred ninety-nine".