423621091 has 2 divisors, whose sum is σ = 423621092. Its totient is φ = 423621090.

The previous prime is 423621089. The next prime is 423621161. The reversal of 423621091 is 190126324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423621091 - 2¹ = 423621089 is a prime.

Together with 423621089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (423621031) 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, 211810545 + 211810546.

It is an arithmetic number, because the mean of its divisors is an integer number (211810546).

Almost surely, 2^423621091 is an apocalyptic number.

423621091 is a deficient number, since it is larger than the sum of its proper divisors (1).

423621091 is an equidigital number, since it uses as much as digits as its factorization.

423621091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 423621091 is about 20582.0575016202. The cubic root of 423621091 is about 751.0332963371.

The spelling of 423621091 in words is "four hundred twenty-three million, six hundred twenty-one thousand, ninety-one".