1123111551 has 16 divisors (see below), whose sum is σ = 1589080320. Its totient is φ = 704045760.

The previous prime is 1123111543. The next prime is 1123111567. The reversal of 1123111551 is 1551113211.

It is not a de Polignac number, because 1123111551 - 2³ = 1123111543 is a prime.

It is a super-2 number, since 2×1123111551² = 2522759111979251202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123111051) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 133870 + ... + 142011.

It is an arithmetic number, because the mean of its divisors is an integer number (99317520).

Almost surely, 2^1123111551 is an apocalyptic number.

1123111551 is a deficient number, since it is larger than the sum of its proper divisors (465968769).

1123111551 is a wasteful number, since it uses less digits than its factorization.

1123111551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275966.

The product of its digits is 150, while the sum is 21.

The square root of 1123111551 is about 33512.8565031392. The cubic root of 1123111551 is about 1039.4596400865.

Adding to 1123111551 its reverse (1551113211), we get a palindrome (2674224762).

The spelling of 1123111551 in words is "one billion, one hundred twenty-three million, one hundred eleven thousand, five hundred fifty-one".