1243130111 has 4 divisors (see below), whose sum is σ = 1243200912. Its totient is φ = 1243059312.

The previous prime is 1243130089. The next prime is 1243130123. The reversal of 1243130111 is 1110313421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1243130111 - 2²² = 1238935807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243130111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243160111) 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, 12950 + ... + 51516.

It is an arithmetic number, because the mean of its divisors is an integer number (310800228).

Almost surely, 2^1243130111 is an apocalyptic number.

1243130111 is a deficient number, since it is larger than the sum of its proper divisors (70801).

1243130111 is an equidigital number, since it uses as much as digits as its factorization.

1243130111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70800.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1243130111 is about 35258.0503006051. The cubic root of 1243130111 is about 1075.2402883806.

Adding to 1243130111 its reverse (1110313421), we get a palindrome (2353443532).

The spelling of 1243130111 in words is "one billion, two hundred forty-three million, one hundred thirty thousand, one hundred eleven".