1205321399 has 2 divisors, whose sum is σ = 1205321400. Its totient is φ = 1205321398.

The previous prime is 1205321339. The next prime is 1205321423. The reversal of 1205321399 is 9931235021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205321399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205321339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602660699 + 602660700.

It is an arithmetic number, because the mean of its divisors is an integer number (602660700).

Almost surely, 2^1205321399 is an apocalyptic number.

1205321399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205321399 is an equidigital number, since it uses as much as digits as its factorization.

1205321399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 1205321399 is about 34717.7389672772. The cubic root of 1205321399 is about 1064.2270391825.

The spelling of 1205321399 in words is "one billion, two hundred five million, three hundred twenty-one thousand, three hundred ninety-nine".