1242460909 has 2 divisors, whose sum is σ = 1242460910. Its totient is φ = 1242460908.

The previous prime is 1242460907. The next prime is 1242460957. The reversal of 1242460909 is 9090642421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207910025 + 34550884 = 34755^2 + 5878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242460909 - 2¹ = 1242460907 is a prime.

It is a super-2 number, since 2×1242460909² = 3087418220786212562, which contains 22 as substring.

Together with 1242460907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242460903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621230454 + 621230455.

It is an arithmetic number, because the mean of its divisors is an integer number (621230455).

Almost surely, 2^1242460909 is an apocalyptic number.

It is an amenable number.

1242460909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242460909 is an equidigital number, since it uses as much as digits as its factorization.

1242460909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1242460909 is about 35248.5589634527. The cubic root of 1242460909 is about 1075.0473125742.

The spelling of 1242460909 in words is "one billion, two hundred forty-two million, four hundred sixty thousand, nine hundred nine".