1109622721 has 3 divisors (see below), whose sum is σ = 1109656033. Its totient is φ = 1109589410.

The previous prime is 1109622677. The next prime is 1109622769. The reversal of 1109622721 is 1272269011.

The square root of 1109622721 is 33311.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1109622721 - 2²⁵ = 1076068289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109622121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16656 + ... + 49966.

Almost surely, 2^1109622721 is an apocalyptic number.

1109622721 is the 33311-st square number.

1109622721 is the 16656-th centered octagonal number.

It is an amenable number.

1109622721 is a deficient number, since it is larger than the sum of its proper divisors (33312).

1109622721 is an frugal number, since it uses more digits than its factorization.

1109622721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66622 (or 33311 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The cubic root of 1109622721 is about 1035.2814845799.

The spelling of 1109622721 in words is "one billion, one hundred nine million, six hundred twenty-two thousand, seven hundred twenty-one".