4791721 has 9 divisors (see below), whose sum is σ = 5293533. Its totient is φ = 4334220.

The previous prime is 4791653. The next prime is 4791737. The reversal of 4791721 is 1271974.

The square root of 4791721 is 2189.

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

It is not a de Polignac number, because 4791721 - 2²¹ = 2694569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4791221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23980 + ... + 24178.

Almost surely, 2^4791721 is an apocalyptic number.

4791721 is the 2189-th square number.

4791721 is the 1095-th centered octagonal number.

It is an amenable number.

4791721 is a deficient number, since it is larger than the sum of its proper divisors (501812).

4791721 is an equidigital number, since it uses as much as digits as its factorization.

4791721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 210 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The cubic root of 4791721 is about 168.5894942062.

The spelling of 4791721 in words is "four million, seven hundred ninety-one thousand, seven hundred twenty-one".