424317991 has 4 divisors (see below), whose sum is σ = 424529352. Its totient is φ = 424106632.

The previous prime is 424317989. The next prime is 424317997. The reversal of 424317991 is 199713424.

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 424317991 - 2¹ = 424317989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424317997) 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 in 3 ways as a sum of consecutive naturals, for example, 102640 + ... + 106693.

It is an arithmetic number, because the mean of its divisors is an integer number (106132338).

Almost surely, 2^424317991 is an apocalyptic number.

424317991 is a deficient number, since it is larger than the sum of its proper divisors (211361).

424317991 is a wasteful number, since it uses less digits than its factorization.

424317991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211360.

The product of its digits is 54432, while the sum is 40.

The square root of 424317991 is about 20598.9803388420. The cubic root of 424317991 is about 751.4449128851. Note that the first 3 decimals are identical.

The spelling of 424317991 in words is "four hundred twenty-four million, three hundred seventeen thousand, nine hundred ninety-one".