2811138739 has 4 divisors (see below), whose sum is σ = 2811586624. Its totient is φ = 2810690856.

The previous prime is 2811138697. The next prime is 2811138779. The reversal of 2811138739 is 9378311182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2811138739 - 2²³ = 2802750131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2811138695 and 2811138704.

It is not an unprimeable number, because it can be changed into a prime (2811138779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214392 + ... + 227125.

It is an arithmetic number, because the mean of its divisors is an integer number (702896656).

Almost surely, 2^2811138739 is an apocalyptic number.

2811138739 is a deficient number, since it is larger than the sum of its proper divisors (447885).

2811138739 is an equidigital number, since it uses as much as digits as its factorization.

2811138739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447884.

The product of its digits is 72576, while the sum is 43.

The square root of 2811138739 is about 53020.1729438900. The cubic root of 2811138739 is about 1411.3262740113.

The spelling of 2811138739 in words is "two billion, eight hundred eleven million, one hundred thirty-eight thousand, seven hundred thirty-nine".