1242152449 has 2 divisors, whose sum is σ = 1242152450. Its totient is φ = 1242152448.

The previous prime is 1242152383. The next prime is 1242152453. The reversal of 1242152449 is 9442512421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1241857600 + 294849 = 35240^2 + 543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242152449 - 2⁷ = 1242152321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242152459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621076224 + 621076225.

It is an arithmetic number, because the mean of its divisors is an integer number (621076225).

Almost surely, 2^1242152449 is an apocalyptic number.

It is an amenable number.

1242152449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242152449 is an equidigital number, since it uses as much as digits as its factorization.

1242152449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 1242152449 is about 35244.1831938265. The cubic root of 1242152449 is about 1074.9583395429.

The spelling of 1242152449 in words is "one billion, two hundred forty-two million, one hundred fifty-two thousand, four hundred forty-nine".