423424841891 has 4 divisors (see below), whose sum is σ = 427382083512. Its totient is φ = 419467600272.

The previous prime is 423424841887. The next prime is 423424841923. The reversal of 423424841891 is 198148424324.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 423424841891 - 2² = 423424841887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423424841291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978620650 + ... + 1978620863.

It is an arithmetic number, because the mean of its divisors is an integer number (106845520878).

Almost surely, 2^423424841891 is an apocalyptic number.

423424841891 is a deficient number, since it is larger than the sum of its proper divisors (3957241621).

423424841891 is a wasteful number, since it uses less digits than its factorization.

423424841891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957241620.

The product of its digits is 1769472, while the sum is 50.

The spelling of 423424841891 in words is "four hundred twenty-three billion, four hundred twenty-four million, eight hundred forty-one thousand, eight hundred ninety-one".