421431 has 4 divisors (see below), whose sum is σ = 561912. Its totient is φ = 280952.

The previous prime is 421423. The next prime is 421433. The reversal of 421431 is 134124.

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 421431 - 2³ = 421423 is a prime.

It is a super-2 number, since 2×421431² = 355208175522, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 421431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70236 + ... + 70241.

It is an arithmetic number, because the mean of its divisors is an integer number (140478).

2⁴²¹⁴³¹ is an apocalyptic number.

421431 is a deficient number, since it is larger than the sum of its proper divisors (140481).

421431 is a wasteful number, since it uses less digits than its factorization.

421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140480.

The product of its digits is 96, while the sum is 15.

The square root of 421431 is about 649.1771715025. The cubic root of 421431 is about 74.9736796532.

Adding to 421431 its reverse (134124), we get a palindrome (555555).

The spelling of 421431 in words is "four hundred twenty-one thousand, four hundred thirty-one".