1213873189919 has 4 divisors (see below), whose sum is σ = 1307248050696. Its totient is φ = 1120498329144.

The previous prime is 1213873189901. The next prime is 1213873189937. The reversal of 1213873189919 is 9199813783121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1213873189901) and next prime (1213873189937).

It is a cyclic number.

It is not a de Polignac number, because 1213873189919 - 2⁸ = 1213873189663 is a prime.

It is a super-2 number, since 2×1213873189919² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213870189919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46687430369 + ... + 46687430394.

It is an arithmetic number, because the mean of its divisors is an integer number (326812012674).

Almost surely, 2^{1213873189919} is an apocalyptic number.

1213873189919 is a deficient number, since it is larger than the sum of its proper divisors (93374860777).

1213873189919 is an equidigital number, since it uses as much as digits as its factorization.

1213873189919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93374860776.

The product of its digits is 5878656, while the sum is 62.

The spelling of 1213873189919 in words is "one trillion, two hundred thirteen billion, eight hundred seventy-three million, one hundred eighty-nine thousand, nine hundred nineteen".