1123121113 has 4 divisors (see below), whose sum is σ = 1133617680. Its totient is φ = 1112624548.

The previous prime is 1123121107. The next prime is 1123121123. The reversal of 1123121113 is 3111213211.

It is a happy number.

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 not a de Polignac number, because 1123121113 - 2²¹ = 1121023961 is a prime.

It is a super-2 number, since 2×1123121113² = 2522802068932717538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123121123) 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, 5248123 + ... + 5248336.

It is an arithmetic number, because the mean of its divisors is an integer number (283404420).

Almost surely, 2^1123121113 is an apocalyptic number.

It is an amenable number.

1123121113 is a deficient number, since it is larger than the sum of its proper divisors (10496567).

1123121113 is a wasteful number, since it uses less digits than its factorization.

1123121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10496566.

The product of its digits is 36, while the sum is 16.

The square root of 1123121113 is about 33512.9991645033. Note that the first 3 decimals coincide. The cubic root of 1123121113 is about 1039.4625900116.

Adding to 1123121113 its reverse (3111213211), we get a palindrome (4234334324).

The spelling of 1123121113 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred thirteen".