1242120313 has 8 divisors (see below), whose sum is σ = 1481286528. Its totient is φ = 1018384224.

The previous prime is 1242120251. The next prime is 1242120323. The reversal of 1242120313 is 3130212421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242120313 - 2¹³ = 1242112121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242120323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3857356 + ... + 3857677.

It is an arithmetic number, because the mean of its divisors is an integer number (185160816).

Almost surely, 2^1242120313 is an apocalyptic number.

It is an amenable number.

1242120313 is a deficient number, since it is larger than the sum of its proper divisors (239166215).

1242120313 is an equidigital number, since it uses as much as digits as its factorization.

1242120313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715063.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1242120313 is about 35243.7272858590. The cubic root of 1242120313 is about 1074.9490693015.

Adding to 1242120313 its reverse (3130212421), we get a palindrome (4372332734).

The spelling of 1242120313 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, three hundred thirteen".