1123614721 has 4 divisors (see below), whose sum is σ = 1124182192. Its totient is φ = 1123047252.

The previous prime is 1123614719. The next prime is 1123614733. The reversal of 1123614721 is 1274163211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1274163211 = 10799 ⋅117989.

It is a cyclic number.

It is not a de Polignac number, because 1123614721 - 2¹ = 1123614719 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 1123614721.

It is not an unprimeable number, because it can be changed into a prime (1123614421) 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, 280755 + ... + 284728.

It is an arithmetic number, because the mean of its divisors is an integer number (281045548).

It is a Proth number, since it is equal to 17145 ⋅ 2¹⁶ + 1 and 17145 < 2¹⁶.

Almost surely, 2^1123614721 is an apocalyptic number.

It is an amenable number.

1123614721 is a deficient number, since it is larger than the sum of its proper divisors (567471).

1123614721 is an equidigital number, since it uses as much as digits as its factorization.

1123614721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567470.

The product of its digits is 2016, while the sum is 28.

The square root of 1123614721 is about 33520.3627814497. The cubic root of 1123614721 is about 1039.6148478271.

Adding to 1123614721 its reverse (1274163211), we get a palindrome (2397777932).

The spelling of 1123614721 in words is "one billion, one hundred twenty-three million, six hundred fourteen thousand, seven hundred twenty-one".