1243131123 has 16 divisors (see below), whose sum is σ = 1807608320. Its totient is φ = 755318304.

The previous prime is 1243131091. The next prime is 1243131151. The reversal of 1243131123 is 3211313421.

It is not a de Polignac number, because 1243131123 - 2⁵ = 1243131091 is a prime.

It is a super-2 number, since 2×1243131123² = 3090749977942482258, which contains 22 as substring.

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 1243131123.

It is not an unprimeable number, because it can be changed into a prime (1243131173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198661 + ... + 204822.

It is an arithmetic number, because the mean of its divisors is an integer number (112975520).

Almost surely, 2^1243131123 is an apocalyptic number.

1243131123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1243131123 is a deficient number, since it is larger than the sum of its proper divisors (564477197).

1243131123 is a wasteful number, since it uses less digits than its factorization.

1243131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403578.

The product of its digits is 432, while the sum is 21.

The square root of 1243131123 is about 35258.0646519346. The cubic root of 1243131123 is about 1075.2405801556.

Adding to 1243131123 its reverse (3211313421), we get a palindrome (4454444544).

The spelling of 1243131123 in words is "one billion, two hundred forty-three million, one hundred thirty-one thousand, one hundred twenty-three".