431534221 has 2 divisors, whose sum is σ = 431534222. Its totient is φ = 431534220.

The previous prime is 431534153. The next prime is 431534249. The reversal of 431534221 is 122435134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255680100 + 175854121 = 15990^2 + 13261^2 .

It is a cyclic number.

It is not a de Polignac number, because 431534221 - 2⁹ = 431533709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431534021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215767110 + 215767111.

It is an arithmetic number, because the mean of its divisors is an integer number (215767111).

Almost surely, 2^431534221 is an apocalyptic number.

It is an amenable number.

431534221 is a deficient number, since it is larger than the sum of its proper divisors (1).

431534221 is an equidigital number, since it uses as much as digits as its factorization.

431534221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 431534221 is about 20773.4017676451. The cubic root of 431534221 is about 755.6808448427.

Adding to 431534221 its reverse (122435134), we get a palindrome (553969355).

It can be divided in two parts, 43153 and 4221, that added together give a palindrome (47374).

The spelling of 431534221 in words is "four hundred thirty-one million, five hundred thirty-four thousand, two hundred twenty-one".