1242031123 has 4 divisors (see below), whose sum is σ = 1242138240. Its totient is φ = 1241924008.

The previous prime is 1242031093. The next prime is 1242031199. The reversal of 1242031123 is 3211302421.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3211302421 = 9337 ⋅343933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242031123 is a prime.

It is a super-2 number, since 2×1242031123² = 3085282621001282258, 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 1242031123.

It is not an unprimeable number, because it can be changed into a prime (1242037123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33715 + ... + 60172.

It is an arithmetic number, because the mean of its divisors is an integer number (310534560).

Almost surely, 2^1242031123 is an apocalyptic number.

1242031123 is a deficient number, since it is larger than the sum of its proper divisors (107117).

1242031123 is an equidigital number, since it uses as much as digits as its factorization.

1242031123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107116.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1242031123 is about 35242.4619315961. The cubic root of 1242031123 is about 1074.9233399092.

Adding to 1242031123 its reverse (3211302421), we get a palindrome (4453333544).

The spelling of 1242031123 in words is "one billion, two hundred forty-two million, thirty-one thousand, one hundred twenty-three".