2639997973 has 2 divisors, whose sum is σ = 2639997974. Its totient is φ = 2639997972.

The previous prime is 2639997931. The next prime is 2639997991. The reversal of 2639997973 is 3797999362.

2639997973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2216338084 + 423659889 = 47078^2 + 20583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639997973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639997673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319998986 + 1319998987.

It is an arithmetic number, because the mean of its divisors is an integer number (1319998987).

Almost surely, 2^2639997973 is an apocalyptic number.

It is an amenable number.

2639997973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639997973 is an equidigital number, since it uses as much as digits as its factorization.

2639997973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34720812, while the sum is 64.

The square root of 2639997973 is about 51380.9105894397. The cubic root of 2639997973 is about 1382.0842922792.

The spelling of 2639997973 in words is "two billion, six hundred thirty-nine million, nine hundred ninety-seven thousand, nine hundred seventy-three".