2431221643 has 2 divisors, whose sum is σ = 2431221644. Its totient is φ = 2431221642.

The previous prime is 2431221631. The next prime is 2431221679. The reversal of 2431221643 is 3461221342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2431221643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2431221623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1215610821 + 1215610822.

It is an arithmetic number, because the mean of its divisors is an integer number (1215610822).

Almost surely, 2^2431221643 is an apocalyptic number.

2431221643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2431221643 is an equidigital number, since it uses as much as digits as its factorization.

2431221643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 2431221643 is about 49307.4197560570. The cubic root of 2431221643 is about 1344.6466815622.

Adding to 2431221643 its reverse (3461221342), we get a palindrome (5892442985).

The spelling of 2431221643 in words is "two billion, four hundred thirty-one million, two hundred twenty-one thousand, six hundred forty-three".