1123013551551 has 4 divisors (see below), whose sum is σ = 1497351402072. Its totient is φ = 748675701032.

The previous prime is 1123013551547. The next prime is 1123013551553. The reversal of 1123013551551 is 1551553103211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1123013551551 - 2² = 1123013551547 is a prime.

It is a super-2 number, since 2×1123013551551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123013551553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187168925256 + ... + 187168925261.

It is an arithmetic number, because the mean of its divisors is an integer number (374337850518).

Almost surely, 2^{1123013551551} is an apocalyptic number.

1123013551551 is a deficient number, since it is larger than the sum of its proper divisors (374337850521).

1123013551551 is an equidigital number, since it uses as much as digits as its factorization.

1123013551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374337850520.

The product of its (nonzero) digits is 11250, while the sum is 33.

Adding to 1123013551551 its reverse (1551553103211), we get a palindrome (2674566654762).

The spelling of 1123013551551 in words is "one trillion, one hundred twenty-three billion, thirteen million, five hundred fifty-one thousand, five hundred fifty-one".