1243331113 has 4 divisors (see below), whose sum is σ = 1243477648. Its totient is φ = 1243184580.

The previous prime is 1243331107. The next prime is 1243331137. The reversal of 1243331113 is 3111333421.

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 1243331113 - 2¹⁷ = 1243200041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243331213) 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, 59703 + ... + 77788.

It is an arithmetic number, because the mean of its divisors is an integer number (310869412).

Almost surely, 2^1243331113 is an apocalyptic number.

It is an amenable number.

1243331113 is a deficient number, since it is larger than the sum of its proper divisors (146535).

1243331113 is an equidigital number, since it uses as much as digits as its factorization.

1243331113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146534.

The product of its digits is 648, while the sum is 22.

The square root of 1243331113 is about 35260.9006266147. The cubic root of 1243331113 is about 1075.2982372091.

Adding to 1243331113 its reverse (3111333421), we get a palindrome (4354664534).

The spelling of 1243331113 in words is "one billion, two hundred forty-three million, three hundred thirty-one thousand, one hundred thirteen".