1243312193 has 4 divisors (see below), whose sum is σ = 1248887808. Its totient is φ = 1237736580.

The previous prime is 1243312183. The next prime is 1243312199. The reversal of 1243312193 is 3912133421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243312193 - 2²⁸ = 974876737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243312199) 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, 2787473 + ... + 2787918.

It is an arithmetic number, because the mean of its divisors is an integer number (312221952).

Almost surely, 2^1243312193 is an apocalyptic number.

It is an amenable number.

1243312193 is a deficient number, since it is larger than the sum of its proper divisors (5575615).

1243312193 is an equidigital number, since it uses as much as digits as its factorization.

1243312193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5575614.

The product of its digits is 3888, while the sum is 29.

The square root of 1243312193 is about 35260.6323397638. The cubic root of 1243312193 is about 1075.2927828439.

The spelling of 1243312193 in words is "one billion, two hundred forty-three million, three hundred twelve thousand, one hundred ninety-three".