1243143111 has 8 divisors (see below), whose sum is σ = 1894313344. Its totient is φ = 710367480.

The previous prime is 1243143107. The next prime is 1243143149. The reversal of 1243143111 is 1113413421.

1243143111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243143111 - 2² = 1243143107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 59197291 = 1243143111 / (1 + 2 + 4 + 3 + 1 + 4 + 3 + 1 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243143151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29598625 + ... + 29598666.

It is an arithmetic number, because the mean of its divisors is an integer number (236789168).

Almost surely, 2^1243143111 is an apocalyptic number.

1243143111 is a deficient number, since it is larger than the sum of its proper divisors (651170233).

1243143111 is an equidigital number, since it uses as much as digits as its factorization.

1243143111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59197301.

The product of its digits is 288, while the sum is 21.

The square root of 1243143111 is about 35258.2346551837. The cubic root of 1243143111 is about 1075.2440364664.

Adding to 1243143111 its reverse (1113413421), we get a palindrome (2356556532).

The spelling of 1243143111 in words is "one billion, two hundred forty-three million, one hundred forty-three thousand, one hundred eleven".