2639971 has 2 divisors, whose sum is σ = 2639972. Its totient is φ = 2639970.

The previous prime is 2639969. The next prime is 2639999. The reversal of 2639971 is 1799362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2639971 - 2¹ = 2639969 is a prime.

Together with 2639969, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2639971.

It is not a weakly prime, because it can be changed into another prime (2639911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319985 + 1319986.

It is an arithmetic number, because the mean of its divisors is an integer number (1319986).

2^2639971 is an apocalyptic number.

2639971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639971 is an equidigital number, since it uses as much as digits as its factorization.

2639971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 37.

The square root of 2639971 is about 1624.7987567696. The cubic root of 2639971 is about 138.2079585320.

The spelling of 2639971 in words is "two million, six hundred thirty-nine thousand, nine hundred seventy-one".