1242553121 has 2 divisors, whose sum is σ = 1242553122. Its totient is φ = 1242553120.

The previous prime is 1242553097. The next prime is 1242553139. The reversal of 1242553121 is 1213552421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204853521 + 37699600 = 34711^2 + 6140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242553121 - 2³⁰ = 168811297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242550121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621276560 + 621276561.

It is an arithmetic number, because the mean of its divisors is an integer number (621276561).

Almost surely, 2^1242553121 is an apocalyptic number.

It is an amenable number.

1242553121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242553121 is an equidigital number, since it uses as much as digits as its factorization.

1242553121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 1242553121 is about 35249.8669642880. The cubic root of 1242553121 is about 1075.0739075922.

The spelling of 1242553121 in words is "one billion, two hundred forty-two million, five hundred fifty-three thousand, one hundred twenty-one".