2639531899 has 2 divisors, whose sum is σ = 2639531900. Its totient is φ = 2639531898.

The previous prime is 2639531897. The next prime is 2639531959. The reversal of 2639531899 is 9981359362.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2639531899 - 2¹ = 2639531897 is a prime.

Together with 2639531897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2639531897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319765949 + 1319765950.

It is an arithmetic number, because the mean of its divisors is an integer number (1319765950).

Almost surely, 2^2639531899 is an apocalyptic number.

2639531899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639531899 is an equidigital number, since it uses as much as digits as its factorization.

2639531899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 55.

The square root of 2639531899 is about 51376.3749110425. The cubic root of 2639531899 is about 1382.0029549106.

The spelling of 2639531899 in words is "two billion, six hundred thirty-nine million, five hundred thirty-one thousand, eight hundred ninety-nine".