1123701721 has 4 divisors (see below), whose sum is σ = 1123817344. Its totient is φ = 1123586100.

The previous prime is 1123701697. The next prime is 1123701727. The reversal of 1123701721 is 1271073211.

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 1123701721 - 2⁹ = 1123701209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123701727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41745 + ... + 63166.

It is an arithmetic number, because the mean of its divisors is an integer number (280954336).

Almost surely, 2^1123701721 is an apocalyptic number.

It is an amenable number.

1123701721 is a deficient number, since it is larger than the sum of its proper divisors (115623).

1123701721 is a wasteful number, since it uses less digits than its factorization.

1123701721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115622.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1123701721 is about 33521.6604749824. The cubic root of 1123701721 is about 1039.6416791350.

Adding to 1123701721 its reverse (1271073211), we get a palindrome (2394774932).

The spelling of 1123701721 in words is "one billion, one hundred twenty-three million, seven hundred one thousand, seven hundred twenty-one".