1242515555 has 8 divisors (see below), whose sum is σ = 1509892800. Its totient is φ = 981429696.

The previous prime is 1242515551. The next prime is 1242515581. The reversal of 1242515555 is 5555152421.

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 1242515555 - 2² = 1242515551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242515551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1572410 + ... + 1573199.

It is an arithmetic number, because the mean of its divisors is an integer number (188736600).

Almost surely, 2^1242515555 is an apocalyptic number.

1242515555 is a deficient number, since it is larger than the sum of its proper divisors (267377245).

1242515555 is an equidigital number, since it uses as much as digits as its factorization.

1242515555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145693.

The product of its digits is 50000, while the sum is 35.

The square root of 1242515555 is about 35249.3341071856. The cubic root of 1242515555 is about 1075.0630732778.

Adding to 1242515555 its reverse (5555152421), we get a palindrome (6797667976).

The spelling of 1242515555 in words is "one billion, two hundred forty-two million, five hundred fifteen thousand, five hundred fifty-five".