1111242555 has 24 divisors (see below), whose sum is σ = 1928221152. Its totient is φ = 592026624.

The previous prime is 1111242547. The next prime is 1111242563. The reversal of 1111242555 is 5552421111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1111242547) and next prime (1111242563).

It is not a de Polignac number, because 1111242555 - 2³ = 1111242547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30747 + ... + 56283.

It is an arithmetic number, because the mean of its divisors is an integer number (80342548).

Almost surely, 2^1111242555 is an apocalyptic number.

1111242555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1111242555 is a deficient number, since it is larger than the sum of its proper divisors (816978597).

1111242555 is a wasteful number, since it uses less digits than its factorization.

1111242555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26515 (or 26512 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1111242555 is about 33335.3049333586. The cubic root of 1111242555 is about 1035.7850097133.

Adding to 1111242555 its reverse (5552421111), we get a palindrome (6663663666).

The spelling of 1111242555 in words is "one billion, one hundred eleven million, two hundred forty-two thousand, five hundred fifty-five".