1123551555 has 16 divisors (see below), whose sum is σ = 2054494464. Its totient is φ = 513623520.

The previous prime is 1123551547. The next prime is 1123551557. The reversal of 1123551555 is 5551553211.

It is not a de Polignac number, because 1123551555 - 2³ = 1123551547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123551557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5350141 + ... + 5350350.

It is an arithmetic number, because the mean of its divisors is an integer number (128405904).

Almost surely, 2^1123551555 is an apocalyptic number.

1123551555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1123551555 is a deficient number, since it is larger than the sum of its proper divisors (930942909).

1123551555 is a wasteful number, since it uses less digits than its factorization.

1123551555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700506.

The product of its digits is 18750, while the sum is 33.

The square root of 1123551555 is about 33519.4205648009. The cubic root of 1123551555 is about 1039.5953661962.

The spelling of 1123551555 in words is "one billion, one hundred twenty-three million, five hundred fifty-one thousand, five hundred fifty-five".