4218961 has 2 divisors, whose sum is σ = 4218962. Its totient is φ = 4218960.

The previous prime is 4218947. The next prime is 4218967. The reversal of 4218961 is 1698124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4100625 + 118336 = 2025^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 4218961 - 2²¹ = 2121809 is a prime.

It is not a weakly prime, because it can be changed into another prime (4218967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2109480 + 2109481.

It is an arithmetic number, because the mean of its divisors is an integer number (2109481).

Almost surely, 2^4218961 is an apocalyptic number.

It is an amenable number.

4218961 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218961 is an equidigital number, since it uses as much as digits as its factorization.

4218961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 4218961 is about 2054.0109542064. The cubic root of 4218961 is about 161.5852955488.

The spelling of 4218961 in words is "four million, two hundred eighteen thousand, nine hundred sixty-one".