431433221 has 4 divisors (see below), whose sum is σ = 431559072. Its totient is φ = 431307372.

The previous prime is 431433181. The next prime is 431433251. The reversal of 431433221 is 122334134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431433221 - 2¹⁸ = 431171077 is a prime.

It is a super-2 number, since 2×431433221² = 372269248364869682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431433251) 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, 57635 + ... + 64688.

It is an arithmetic number, because the mean of its divisors is an integer number (107889768).

Almost surely, 2^431433221 is an apocalyptic number.

It is an amenable number.

431433221 is a deficient number, since it is larger than the sum of its proper divisors (125851).

431433221 is a wasteful number, since it uses less digits than its factorization.

431433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125850.

The product of its digits is 1728, while the sum is 23.

The square root of 431433221 is about 20770.9706321106. The cubic root of 431433221 is about 755.6218848832.

Adding to 431433221 its reverse (122334134), we get a palindrome (553767355).

It can be divided in two parts, 43143 and 3221, that added together give a palindrome (46364).

The spelling of 431433221 in words is "four hundred thirty-one million, four hundred thirty-three thousand, two hundred twenty-one".