1219954913237 has 2 divisors, whose sum is σ = 1219954913238. Its totient is φ = 1219954913236.

The previous prime is 1219954913197. The next prime is 1219954913239. The reversal of 1219954913237 is 7323194599121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965186388721 + 254768524516 = 982439^2 + 504746^2 .

It is an emirp because it is prime and its reverse (7323194599121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1219954913237 - 2⁶ = 1219954913173 is a prime.

Together with 1219954913239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219954913239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609977456618 + 609977456619.

It is an arithmetic number, because the mean of its divisors is an integer number (609977456619).

Almost surely, 2^{1219954913237} is an apocalyptic number.

It is an amenable number.

1219954913237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219954913237 is an equidigital number, since it uses as much as digits as its factorization.

1219954913237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 56.

The spelling of 1219954913237 in words is "one trillion, two hundred nineteen billion, nine hundred fifty-four million, nine hundred thirteen thousand, two hundred thirty-seven".