4791221 has 2 divisors, whose sum is σ = 4791222. Its totient is φ = 4791220.

The previous prime is 4791197. The next prime is 4791223. The reversal of 4791221 is 1221974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 1500625 = 1814^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 4791221 - 2²² = 596917 is a prime.

Together with 4791223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4791223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2395610 + 2395611.

It is an arithmetic number, because the mean of its divisors is an integer number (2395611).

Almost surely, 2^4791221 is an apocalyptic number.

It is an amenable number.

4791221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4791221 is an equidigital number, since it uses as much as digits as its factorization.

4791221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 4791221 is about 2188.8857896199. The cubic root of 4791221 is about 168.5836300863.

The spelling of 4791221 in words is "four million, seven hundred ninety-one thousand, two hundred twenty-one".