420444091 has 2 divisors, whose sum is σ = 420444092. Its totient is φ = 420444090.

The previous prime is 420444077. The next prime is 420444097. The reversal of 420444091 is 190444024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420444091 - 2⁹ = 420443579 is a prime.

It is not a weakly prime, because it can be changed into another prime (420444097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210222045 + 210222046.

It is an arithmetic number, because the mean of its divisors is an integer number (210222046).

Almost surely, 2^420444091 is an apocalyptic number.

420444091 is a deficient number, since it is larger than the sum of its proper divisors (1).

420444091 is an equidigital number, since it uses as much as digits as its factorization.

420444091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 420444091 is about 20504.7333803685. The cubic root of 420444091 is about 749.1510934320.

The spelling of 420444091 in words is "four hundred twenty million, four hundred forty-four thousand, ninety-one".