431027221 has 2 divisors, whose sum is σ = 431027222. Its totient is φ = 431027220.

The previous prime is 431027189. The next prime is 431027309. The reversal of 431027221 is 122720134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431019121 + 8100 = 20761^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 431027221 - 2⁵ = 431027189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 431027192 and 431027201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431007221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215513610 + 215513611.

It is an arithmetic number, because the mean of its divisors is an integer number (215513611).

Almost surely, 2^431027221 is an apocalyptic number.

It is an amenable number.

431027221 is a deficient number, since it is larger than the sum of its proper divisors (1).

431027221 is an equidigital number, since it uses as much as digits as its factorization.

431027221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 431027221 is about 20761.1950763919. The cubic root of 431027221 is about 755.3847846375.

Adding to 431027221 its reverse (122720134), we get a palindrome (553747355).

The spelling of 431027221 in words is "four hundred thirty-one million, twenty-seven thousand, two hundred twenty-one".