1321174999 has 2 divisors, whose sum is σ = 1321175000. Its totient is φ = 1321174998.

The previous prime is 1321174991. The next prime is 1321175057. The reversal of 1321174999 is 9994711231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321174999 - 2³ = 1321174991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321174991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660587499 + 660587500.

It is an arithmetic number, because the mean of its divisors is an integer number (660587500).

Almost surely, 2^1321174999 is an apocalyptic number.

1321174999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321174999 is an equidigital number, since it uses as much as digits as its factorization.

1321174999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 1321174999 is about 36347.9710437873. The cubic root of 1321174999 is about 1097.2867009373.

The spelling of 1321174999 in words is "one billion, three hundred twenty-one million, one hundred seventy-four thousand, nine hundred ninety-nine".