2298147721 has 3 divisors (see below), whose sum is σ = 2298195661. Its totient is φ = 2298099782.

The previous prime is 2298147653. The next prime is 2298147739. The reversal of 2298147721 is 1277418922.

The square root of 2298147721 is 47939.

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 2298147721 - 2¹⁵ = 2298114953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2298147781) 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, 23970 + ... + 71908.

Almost surely, 2^2298147721 is an apocalyptic number.

2298147721 is the 47939-th square number.

2298147721 is the 23970-th centered octagonal number.

It is an amenable number.

2298147721 is a deficient number, since it is larger than the sum of its proper divisors (47940).

2298147721 is an frugal number, since it uses more digits than its factorization.

2298147721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95878 (or 47939 counting only the distinct ones).

The product of its digits is 112896, while the sum is 43.

The cubic root of 2298147721 is about 1319.6516759598.

Multiplying 2298147721 by its product of digits (112896), we get a square (259451685110016 = 16107504²).

The spelling of 2298147721 in words is "two billion, two hundred ninety-eight million, one hundred forty-seven thousand, seven hundred twenty-one".