1243121243 has 24 divisors (see below), whose sum is σ = 1628922528. Its totient is φ = 925696512.

The previous prime is 1243121207. The next prime is 1243121261. The reversal of 1243121243 is 3421213421.

It is a de Polignac number, because none of the positive numbers 2^k-1243121243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243121203) 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 23 ways as a sum of consecutive naturals, for example, 10796 + ... + 51017.

It is an arithmetic number, because the mean of its divisors is an integer number (67871772).

Almost surely, 2^1243121243 is an apocalyptic number.

1243121243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1243121243 is a deficient number, since it is larger than the sum of its proper divisors (385801285).

1243121243 is a wasteful number, since it uses less digits than its factorization.

1243121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61863 (or 61850 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1243121243 is about 35257.9245418672. The cubic root of 1243121243 is about 1075.2377315944.

Adding to 1243121243 its reverse (3421213421), we get a palindrome (4664334664).

The spelling of 1243121243 in words is "one billion, two hundred forty-three million, one hundred twenty-one thousand, two hundred forty-three".