4221691 has 2 divisors, whose sum is σ = 4221692. Its totient is φ = 4221690.

The previous prime is 4221683. The next prime is 4221703. The reversal of 4221691 is 1961224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4221691 - 2³ = 4221683 is a prime.

It is not a weakly prime, because it can be changed into another prime (4221631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110845 + 2110846.

It is an arithmetic number, because the mean of its divisors is an integer number (2110846).

Almost surely, 2^4221691 is an apocalyptic number.

4221691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221691 is an equidigital number, since it uses as much as digits as its factorization.

4221691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 4221691 is about 2054.6754001545. The cubic root of 4221691 is about 161.6201408375.

The spelling of 4221691 in words is "four million, two hundred twenty-one thousand, six hundred ninety-one".