1242153313 has 4 divisors (see below), whose sum is σ = 1242634948. Its totient is φ = 1241671680.

The previous prime is 1242153301. The next prime is 1242153337. The reversal of 1242153313 is 3133512421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 927019809 + 315133504 = 30447^2 + 17752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242153313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242153113) 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 3 ways as a sum of consecutive naturals, for example, 236928 + ... + 242113.

It is an arithmetic number, because the mean of its divisors is an integer number (310658737).

Almost surely, 2^1242153313 is an apocalyptic number.

It is an amenable number.

1242153313 is a deficient number, since it is larger than the sum of its proper divisors (481635).

1242153313 is an equidigital number, since it uses as much as digits as its factorization.

1242153313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481634.

The product of its digits is 2160, while the sum is 25.

The square root of 1242153313 is about 35244.1954511661. The cubic root of 1242153313 is about 1074.9585887779.

Adding to 1242153313 its reverse (3133512421), we get a palindrome (4375665734).

The spelling of 1242153313 in words is "one billion, two hundred forty-two million, one hundred fifty-three thousand, three hundred thirteen".