1209944991139 has 2 divisors, whose sum is σ = 1209944991140. Its totient is φ = 1209944991138.

The previous prime is 1209944991133. The next prime is 1209944991169. The reversal of 1209944991139 is 9311994499021.

It is a weak prime.

It is an emirp because it is prime and its reverse (9311994499021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209944991139 - 2³ = 1209944991131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209944991131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604972495569 + 604972495570.

It is an arithmetic number, because the mean of its divisors is an integer number (604972495570).

Almost surely, 2^{1209944991139} is an apocalyptic number.

1209944991139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209944991139 is an equidigital number, since it uses as much as digits as its factorization.

1209944991139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5668704, while the sum is 61.

The spelling of 1209944991139 in words is "one trillion, two hundred nine billion, nine hundred forty-four million, nine hundred ninety-one thousand, one hundred thirty-nine".