1209398899 has 2 divisors, whose sum is σ = 1209398900. Its totient is φ = 1209398898.

The previous prime is 1209398881. The next prime is 1209398929. The reversal of 1209398899 is 9988939021.

It is a weak prime.

It is an emirp because it is prime and its reverse (9988939021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209398899 - 2⁹ = 1209398387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209398809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604699449 + 604699450.

It is an arithmetic number, because the mean of its divisors is an integer number (604699450).

Almost surely, 2^1209398899 is an apocalyptic number.

1209398899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209398899 is an equidigital number, since it uses as much as digits as its factorization.

1209398899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 58.

The square root of 1209398899 is about 34776.4129691376. The cubic root of 1209398899 is about 1065.4257517343.

The spelling of 1209398899 in words is "one billion, two hundred nine million, three hundred ninety-eight thousand, eight hundred ninety-nine".