1245242555 has 8 divisors (see below), whose sum is σ = 1496194512. Its totient is φ = 994925088.

The previous prime is 1245242527. The next prime is 1245242573. The reversal of 1245242555 is 5552425421.

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 1245242555 - 2³⁰ = 171500731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154292 + ... + 162161.

It is an arithmetic number, because the mean of its divisors is an integer number (187024314).

Almost surely, 2^1245242555 is an apocalyptic number.

1245242555 is a deficient number, since it is larger than the sum of its proper divisors (250951957).

1245242555 is an equidigital number, since it uses as much as digits as its factorization.

1245242555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317245.

The product of its digits is 80000, while the sum is 35.

The square root of 1245242555 is about 35287.9944882109. The cubic root of 1245242555 is about 1075.8489936440.

Adding to 1245242555 its reverse (5552425421), we get a palindrome (6797667976).

The spelling of 1245242555 in words is "one billion, two hundred forty-five million, two hundred forty-two thousand, five hundred fifty-five".