1209985199 has 2 divisors, whose sum is σ = 1209985200. Its totient is φ = 1209985198.

The previous prime is 1209985169. The next prime is 1209985243. The reversal of 1209985199 is 9915899021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209985199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1209985199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209985169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604992599 + 604992600.

It is an arithmetic number, because the mean of its divisors is an integer number (604992600).

Almost surely, 2^1209985199 is an apocalyptic number.

1209985199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209985199 is an equidigital number, since it uses as much as digits as its factorization.

1209985199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 53.

The square root of 1209985199 is about 34784.8415117850. The cubic root of 1209985199 is about 1065.5978918512.

The spelling of 1209985199 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, one hundred ninety-nine".