4161721 has 2 divisors, whose sum is σ = 4161722. Its totient is φ = 4161720.

The previous prime is 4161713. The next prime is 4161727. The reversal of 4161721 is 1271614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4161600 + 121 = 2040^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 4161721 - 2³ = 4161713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4161692 and 4161701.

It is not a weakly prime, because it can be changed into another prime (4161727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080860 + 2080861.

It is an arithmetic number, because the mean of its divisors is an integer number (2080861).

Almost surely, 2^4161721 is an apocalyptic number.

It is an amenable number.

4161721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4161721 is an equidigital number, since it uses as much as digits as its factorization.

4161721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 4161721 is about 2040.0296566472. The cubic root of 4161721 is about 160.8512057122.

The spelling of 4161721 in words is "four million, one hundred sixty-one thousand, seven hundred twenty-one".