2291688687 has 16 divisors (see below), whose sum is σ = 3136451040. Its totient is φ = 1487856000.

The previous prime is 2291688683. The next prime is 2291688701. The reversal of 2291688687 is 7868861922.

It is not a de Polignac number, because 2291688687 - 2² = 2291688683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291688683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43512 + ... + 80477.

It is an arithmetic number, because the mean of its divisors is an integer number (196028190).

Almost surely, 2^2291688687 is an apocalyptic number.

2291688687 is a deficient number, since it is larger than the sum of its proper divisors (844762353).

2291688687 is a wasteful number, since it uses less digits than its factorization.

2291688687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124154.

The product of its digits is 4644864, while the sum is 57.

The square root of 2291688687 is about 47871.5853821450. The cubic root of 2291688687 is about 1318.4142050419.

The spelling of 2291688687 in words is "two billion, two hundred ninety-one million, six hundred eighty-eight thousand, six hundred eighty-seven".