4170721 has 2 divisors, whose sum is σ = 4170722. Its totient is φ = 4170720.

The previous prime is 4170707. The next prime is 4170731. The reversal of 4170721 is 1270714.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 541696 = 1905^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 4170721 - 2⁹ = 4170209 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4170692 and 4170701.

It is not a weakly prime, because it can be changed into another prime (4170731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2085360 + 2085361.

It is an arithmetic number, because the mean of its divisors is an integer number (2085361).

Almost surely, 2^4170721 is an apocalyptic number.

It is an amenable number.

4170721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4170721 is an equidigital number, since it uses as much as digits as its factorization.

4170721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 4170721 is about 2042.2343156455. The cubic root of 4170721 is about 160.9670727256.

The spelling of 4170721 in words is "four million, one hundred seventy thousand, seven hundred twenty-one".