2691871939 has 8 divisors (see below), whose sum is σ = 2768754032. Its totient is φ = 2615639040.

The previous prime is 2691871921. The next prime is 2691871943. The reversal of 2691871939 is 9391781962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2691871939 - 2⁷ = 2691871811 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 2691871939.

It is not an unprimeable number, because it can be changed into a prime (2691871969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153882 + ... + 170479.

It is an arithmetic number, because the mean of its divisors is an integer number (346094254).

Almost surely, 2^2691871939 is an apocalyptic number.

2691871939 is a deficient number, since it is larger than the sum of its proper divisors (76882093).

2691871939 is a wasteful number, since it uses less digits than its factorization.

2691871939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324597.

The product of its digits is 1469664, while the sum is 55.

The square root of 2691871939 is about 51883.2529724188. The cubic root of 2691871939 is about 1391.0779449566.

The spelling of 2691871939 in words is "two billion, six hundred ninety-one million, eight hundred seventy-one thousand, nine hundred thirty-nine".