1105723121 has 4 divisors (see below), whose sum is σ = 1108032000. Its totient is φ = 1103414244.

The previous prime is 1105723117. The next prime is 1105723123. The reversal of 1105723121 is 1213275011.

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 1105723121 - 2² = 1105723117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1105723123) 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, 1153721 + ... + 1154678.

It is an arithmetic number, because the mean of its divisors is an integer number (277008000).

Almost surely, 2^1105723121 is an apocalyptic number.

It is an amenable number.

1105723121 is a deficient number, since it is larger than the sum of its proper divisors (2308879).

1105723121 is an equidigital number, since it uses as much as digits as its factorization.

1105723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308878.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1105723121 is about 33252.4152656615. The cubic root of 1105723121 is about 1034.0672814063.

Adding to 1105723121 its reverse (1213275011), we get a palindrome (2318998132).

The spelling of 1105723121 in words is "one billion, one hundred five million, seven hundred twenty-three thousand, one hundred twenty-one".