1234121309 has 2 divisors, whose sum is σ = 1234121310. Its totient is φ = 1234121308.

The previous prime is 1234121293. The next prime is 1234121333. The reversal of 1234121309 is 9031214321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1110355684 + 123765625 = 33322^2 + 11125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234121309 - 2⁴ = 1234121293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234121389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617060654 + 617060655.

It is an arithmetic number, because the mean of its divisors is an integer number (617060655).

Almost surely, 2^1234121309 is an apocalyptic number.

It is an amenable number.

1234121309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234121309 is an equidigital number, since it uses as much as digits as its factorization.

1234121309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1234121309 is about 35130.0627525770. The cubic root of 1234121309 is about 1072.6366132760.

The spelling of 1234121309 in words is "one billion, two hundred thirty-four million, one hundred twenty-one thousand, three hundred nine".