4645721 has 2 divisors, whose sum is σ = 4645722. Its totient is φ = 4645720.

The previous prime is 4645687. The next prime is 4645733. The reversal of 4645721 is 1275464.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 151321 = 2120^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 4645721 - 2¹⁰ = 4644697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4642721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2322860 + 2322861.

It is an arithmetic number, because the mean of its divisors is an integer number (2322861).

Almost surely, 2^4645721 is an apocalyptic number.

It is an amenable number.

4645721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4645721 is an equidigital number, since it uses as much as digits as its factorization.

4645721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 29.

The square root of 4645721 is about 2155.3934675599. The cubic root of 4645721 is about 166.8595398247.

The spelling of 4645721 in words is "four million, six hundred forty-five thousand, seven hundred twenty-one".