4217561 has 2 divisors, whose sum is σ = 4217562. Its totient is φ = 4217560.

The previous prime is 4217539. The next prime is 4217597. The reversal of 4217561 is 1657124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2310400 + 1907161 = 1520^2 + 1381^2 .

It is a cyclic number.

It is not a de Polignac number, because 4217561 - 2¹⁴ = 4201177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4217561.

It is not a weakly prime, because it can be changed into another prime (4217501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2108780 + 2108781.

It is an arithmetic number, because the mean of its divisors is an integer number (2108781).

Almost surely, 2^4217561 is an apocalyptic number.

It is an amenable number.

4217561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4217561 is an equidigital number, since it uses as much as digits as its factorization.

4217561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 4217561 is about 2053.6701293051. The cubic root of 4217561 is about 161.5674203388.

The spelling of 4217561 in words is "four million, two hundred seventeen thousand, five hundred sixty-one".