2643938971 has 2 divisors, whose sum is σ = 2643938972. Its totient is φ = 2643938970.

The previous prime is 2643938929. The next prime is 2643939017. The reversal of 2643938971 is 1798393462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2643938971 - 2¹⁷ = 2643807899 is a prime.

It is not a weakly prime, because it can be changed into another prime (6643938971) 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, 1321969485 + 1321969486.

It is an arithmetic number, because the mean of its divisors is an integer number (1321969486).

Almost surely, 2^2643938971 is an apocalyptic number.

2643938971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643938971 is an equidigital number, since it uses as much as digits as its factorization.

2643938971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 52.

The square root of 2643938971 is about 51419.2470870588. The cubic root of 2643938971 is about 1382.7716770681.

The spelling of 2643938971 in words is "two billion, six hundred forty-three million, nine hundred thirty-eight thousand, nine hundred seventy-one".