1822350721 has 3 divisors (see below), whose sum is σ = 1822393411. Its totient is φ = 1822308032.

The previous prime is 1822350703. The next prime is 1822350727. The reversal of 1822350721 is 1270532281.

The square root of 1822350721 is 42689.

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 can be written as a sum of positive squares in only one way, i.e., 663629121 + 1158721600 = 25761^2 + 34040^2 .

It is not a de Polignac number, because 1822350721 - 2⁵ = 1822350689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1822350727) 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 2 ways as a sum of consecutive naturals, for example, 21345 + ... + 64033.

Almost surely, 2^1822350721 is an apocalyptic number.

1822350721 is the 42689-th square number.

1822350721 is the 21345-th centered octagonal number.

It is an amenable number.

1822350721 is a deficient number, since it is larger than the sum of its proper divisors (42690).

1822350721 is an frugal number, since it uses more digits than its factorization.

1822350721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85378 (or 42689 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The cubic root of 1822350721 is about 1221.4545763063.

The spelling of 1822350721 in words is "one billion, eight hundred twenty-two million, three hundred fifty thousand, seven hundred twenty-one".