1242133309 has 2 divisors, whose sum is σ = 1242133310. Its totient is φ = 1242133308.

The previous prime is 1242133297. The next prime is 1242133351. The reversal of 1242133309 is 9033312421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1137173284 + 104960025 = 33722^2 + 10245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242133309 - 2⁹ = 1242132797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242133369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621066654 + 621066655.

It is an arithmetic number, because the mean of its divisors is an integer number (621066655).

Almost surely, 2^1242133309 is an apocalyptic number.

It is an amenable number.

1242133309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242133309 is an equidigital number, since it uses as much as digits as its factorization.

1242133309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1242133309 is about 35243.9116586113. The cubic root of 1242133309 is about 1074.9528182645.

The spelling of 1242133309 in words is "one billion, two hundred forty-two million, one hundred thirty-three thousand, three hundred nine".