1234243121 has 2 divisors, whose sum is σ = 1234243122. Its totient is φ = 1234243120.

The previous prime is 1234243099. The next prime is 1234243177. The reversal of 1234243121 is 1213424321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222271521 + 11971600 = 34961^2 + 3460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234243121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1234243421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617121560 + 617121561.

It is an arithmetic number, because the mean of its divisors is an integer number (617121561).

Almost surely, 2^1234243121 is an apocalyptic number.

It is an amenable number.

1234243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234243121 is an equidigital number, since it uses as much as digits as its factorization.

1234243121 is an evil number, because the sum of its binary digits is even.

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

The square root of 1234243121 is about 35131.7964385541. The cubic root of 1234243121 is about 1072.6719030841.

Adding to 1234243121 its reverse (1213424321), we get a palindrome (2447667442).

The spelling of 1234243121 in words is "one billion, two hundred thirty-four million, two hundred forty-three thousand, one hundred twenty-one".