2639139887 has 2 divisors, whose sum is σ = 2639139888. Its totient is φ = 2639139886.

The previous prime is 2639139799. The next prime is 2639139889. The reversal of 2639139887 is 7889319362.

2639139887 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 is a cyclic number.

It is not a de Polignac number, because 2639139887 - 2¹⁰ = 2639138863 is a prime.

Together with 2639139889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639139889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319569943 + 1319569944.

It is an arithmetic number, because the mean of its divisors is an integer number (1319569944).

Almost surely, 2^2639139887 is an apocalyptic number.

2639139887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639139887 is an equidigital number, since it uses as much as digits as its factorization.

2639139887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 2639139887 is about 51372.5596695356. The cubic root of 2639139887 is about 1381.9345351319.

The spelling of 2639139887 in words is "two billion, six hundred thirty-nine million, one hundred thirty-nine thousand, eight hundred eighty-seven".