1123540121 has 4 divisors (see below), whose sum is σ = 1225680144. Its totient is φ = 1021400100.

The previous prime is 1123540109. The next prime is 1123540169. The reversal of 1123540121 is 1210453211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123540121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123540093 and 1123540102.

It is not an unprimeable number, because it can be changed into a prime (1123540321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51069995 + ... + 51070016.

It is an arithmetic number, because the mean of its divisors is an integer number (306420036).

Almost surely, 2^1123540121 is an apocalyptic number.

1123540121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1123540121 is a deficient number, since it is larger than the sum of its proper divisors (102140023).

1123540121 is a wasteful number, since it uses less digits than its factorization.

1123540121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102140022.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1123540121 is about 33519.2500065261. The cubic root of 1123540121 is about 1039.5918396487.

Adding to 1123540121 its reverse (1210453211), we get a palindrome (2333993332).

The spelling of 1123540121 in words is "one billion, one hundred twenty-three million, five hundred forty thousand, one hundred twenty-one".