4217981 has 4 divisors (see below), whose sum is σ = 4440000. Its totient is φ = 3995964.

The previous prime is 4217971. The next prime is 4217987. The reversal of 4217981 is 1897124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4217981 - 2¹⁰ = 4216957 is a prime.

It is a super-2 number, since 2×4217981² = 35582727432722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4217987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110981 + ... + 111018.

It is an arithmetic number, because the mean of its divisors is an integer number (1110000).

Almost surely, 2^4217981 is an apocalyptic number.

It is an amenable number.

4217981 is a deficient number, since it is larger than the sum of its proper divisors (222019).

4217981 is a wasteful number, since it uses less digits than its factorization.

4217981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222018.

The product of its digits is 4032, while the sum is 32.

The square root of 4217981 is about 2053.7723827143. The cubic root of 4217981 is about 161.5727833171.

The spelling of 4217981 in words is "four million, two hundred seventeen thousand, nine hundred eighty-one".