420309091 has 2 divisors, whose sum is σ = 420309092. Its totient is φ = 420309090.

The previous prime is 420309083. The next prime is 420309121. The reversal of 420309091 is 190903024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420309091 - 2³ = 420309083 is a prime.

It is not a weakly prime, because it can be changed into another prime (420309991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210154545 + 210154546.

It is an arithmetic number, because the mean of its divisors is an integer number (210154546).

Almost surely, 2^420309091 is an apocalyptic number.

420309091 is a deficient number, since it is larger than the sum of its proper divisors (1).

420309091 is an equidigital number, since it uses as much as digits as its factorization.

420309091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 420309091 is about 20501.4411932430. The cubic root of 420309091 is about 749.0709034406.

The spelling of 420309091 in words is "four hundred twenty million, three hundred nine thousand, ninety-one".