2691173891 has 8 divisors (see below), whose sum is σ = 3174841344. Its totient is φ = 2232309960.

The previous prime is 2691173869. The next prime is 2691173897. The reversal of 2691173891 is 1983711962.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2691173891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2691173897) 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, 6200645 + ... + 6201078.

It is an arithmetic number, because the mean of its divisors is an integer number (396855168).

Almost surely, 2^2691173891 is an apocalyptic number.

2691173891 is a deficient number, since it is larger than the sum of its proper divisors (483667453).

2691173891 is a wasteful number, since it uses less digits than its factorization.

2691173891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12401761.

The product of its digits is 163296, while the sum is 47.

The square root of 2691173891 is about 51876.5254329933. The cubic root of 2691173891 is about 1390.9576912017.

The spelling of 2691173891 in words is "two billion, six hundred ninety-one million, one hundred seventy-three thousand, eight hundred ninety-one".