1235545555 has 4 divisors (see below), whose sum is σ = 1482654672. Its totient is φ = 988436440.

The previous prime is 1235545523. The next prime is 1235545573. The reversal of 1235545555 is 5555455321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5555455321 = 13 ⋅427342717.

It is not a de Polignac number, because 1235545555 - 2⁵ = 1235545523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123554551 + ... + 123554560.

It is an arithmetic number, because the mean of its divisors is an integer number (370663668).

Almost surely, 2^1235545555 is an apocalyptic number.

1235545555 is a deficient number, since it is larger than the sum of its proper divisors (247109117).

1235545555 is an equidigital number, since it uses as much as digits as its factorization.

1235545555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247109116.

The product of its digits is 375000, while the sum is 40.

The square root of 1235545555 is about 35150.3279501060. The cubic root of 1235545555 is about 1073.0490824792.

The spelling of 1235545555 in words is "one billion, two hundred thirty-five million, five hundred forty-five thousand, five hundred fifty-five".