4220861 has 2 divisors, whose sum is σ = 4220862. Its totient is φ = 4220860.

The previous prime is 4220857. The next prime is 4220873. The reversal of 4220861 is 1680224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2343961 + 1876900 = 1531^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220861 - 2² = 4220857 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4220851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110430 + 2110431.

It is an arithmetic number, because the mean of its divisors is an integer number (2110431).

Almost surely, 2^4220861 is an apocalyptic number.

It is an amenable number.

4220861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4220861 is an equidigital number, since it uses as much as digits as its factorization.

4220861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 4220861 is about 2054.4734118503. The cubic root of 4220861 is about 161.6095484384.

The spelling of 4220861 in words is "four million, two hundred twenty thousand, eight hundred sixty-one".