1238005121 has 2 divisors, whose sum is σ = 1238005122. Its totient is φ = 1238005120.

The previous prime is 1238005081. The next prime is 1238005123. The reversal of 1238005121 is 1215008321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641912896 + 596092225 = 25336^2 + 24415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1238005121 is a prime.

Together with 1238005123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1238005123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619002560 + 619002561.

It is an arithmetic number, because the mean of its divisors is an integer number (619002561).

Almost surely, 2^1238005121 is an apocalyptic number.

It is an amenable number.

1238005121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238005121 is an equidigital number, since it uses as much as digits as its factorization.

1238005121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1238005121 is about 35185.2969434677. The cubic root of 1238005121 is about 1073.7606401333.

The spelling of 1238005121 in words is "one billion, two hundred thirty-eight million, five thousand, one hundred twenty-one".