1243123897319 has 4 divisors (see below), whose sum is σ = 1243151529960. Its totient is φ = 1243096264680.

The previous prime is 1243123897313. The next prime is 1243123897331. The reversal of 1243123897319 is 9137983213421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1243123897319 - 2⁴ = 1243123897303 is a prime.

It is a super-2 number, since 2×1243123897319² (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 (1243123897313) 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, 13748729 + ... + 13838850.

It is an arithmetic number, because the mean of its divisors is an integer number (310787882490).

Almost surely, 2^{1243123897319} is an apocalyptic number.

1243123897319 is a deficient number, since it is larger than the sum of its proper divisors (27632641).

1243123897319 is an equidigital number, since it uses as much as digits as its factorization.

1243123897319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27632640.

The product of its digits is 1959552, while the sum is 53.

The spelling of 1243123897319 in words is "one trillion, two hundred forty-three billion, one hundred twenty-three million, eight hundred ninety-seven thousand, three hundred nineteen".