1105721 has 4 divisors (see below), whose sum is σ = 1108992. Its totient is φ = 1102452.

The previous prime is 1105711. The next prime is 1105757. The reversal of 1105721 is 1275011.

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-1105721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1105721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1105711) 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, 1061 + ... + 1826.

It is an arithmetic number, because the mean of its divisors is an integer number (277248).

2^1105721 is an apocalyptic number.

It is an amenable number.

1105721 is a deficient number, since it is larger than the sum of its proper divisors (3271).

1105721 is an equidigital number, since it uses as much as digits as its factorization.

1105721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 1105721 is about 1051.5326908851. The cubic root of 1105721 is about 103.4066620223.

The spelling of 1105721 in words is "one million, one hundred five thousand, seven hundred twenty-one".