421431565 has 8 divisors (see below), whose sum is σ = 505880928. Its totient is φ = 337036560.

The previous prime is 421431551. The next prime is 421431589. The reversal of 421431565 is 565134124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421431565 - 2¹⁷ = 421300493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6054 + ... + 29656.

It is an arithmetic number, because the mean of its divisors is an integer number (63235116).

Almost surely, 2^421431565 is an apocalyptic number.

It is an amenable number.

421431565 is a deficient number, since it is larger than the sum of its proper divisors (84449363).

421431565 is a wasteful number, since it uses less digits than its factorization.

421431565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27179.

The product of its digits is 14400, while the sum is 31.

The square root of 421431565 is about 20528.7984304976. The cubic root of 421431565 is about 749.7371315814.

Adding to 421431565 its reverse (565134124), we get a palindrome (986565689).

The spelling of 421431565 in words is "four hundred twenty-one million, four hundred thirty-one thousand, five hundred sixty-five".