431840621 has 2 divisors, whose sum is σ = 431840622. Its totient is φ = 431840620.

The previous prime is 431840611. The next prime is 431840677. The reversal of 431840621 is 126048134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331640521 + 100200100 = 18211^2 + 10010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431840621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431840611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215920310 + 215920311.

It is an arithmetic number, because the mean of its divisors is an integer number (215920311).

Almost surely, 2^431840621 is an apocalyptic number.

It is an amenable number.

431840621 is a deficient number, since it is larger than the sum of its proper divisors (1).

431840621 is an equidigital number, since it uses as much as digits as its factorization.

431840621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 431840621 is about 20780.7752742769. The cubic root of 431840621 is about 755.8596532441.

Adding to 431840621 its reverse (126048134), we get a palindrome (557888755).

The spelling of 431840621 in words is "four hundred thirty-one million, eight hundred forty thousand, six hundred twenty-one".