1209985363 has 2 divisors, whose sum is σ = 1209985364. Its totient is φ = 1209985362.

The previous prime is 1209985351. The next prime is 1209985367. The reversal of 1209985363 is 3635899021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209985363 - 2⁵ = 1209985331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209985367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604992681 + 604992682.

It is an arithmetic number, because the mean of its divisors is an integer number (604992682).

Almost surely, 2^1209985363 is an apocalyptic number.

1209985363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209985363 is an equidigital number, since it uses as much as digits as its factorization.

1209985363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 1209985363 is about 34784.8438691336. The cubic root of 1209985363 is about 1065.5979399945.

The spelling of 1209985363 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, three hundred sixty-three".