2661349139 has 4 divisors (see below), whose sum is σ = 2665567440. Its totient is φ = 2657130840.

The previous prime is 2661349129. The next prime is 2661349151. The reversal of 2661349139 is 9319431662.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661349139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661349139.

It is not an unprimeable number, because it can be changed into a prime (2661349129) 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, 2108204 + ... + 2109465.

It is an arithmetic number, because the mean of its divisors is an integer number (666391860).

Almost surely, 2^2661349139 is an apocalyptic number.

2661349139 is a deficient number, since it is larger than the sum of its proper divisors (4218301).

2661349139 is an equidigital number, since it uses as much as digits as its factorization.

2661349139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218300.

The product of its digits is 209952, while the sum is 44.

The square root of 2661349139 is about 51588.2655164912. The cubic root of 2661349139 is about 1385.8001934083.

The spelling of 2661349139 in words is "two billion, six hundred sixty-one million, three hundred forty-nine thousand, one hundred thirty-nine".