2891130991 has 8 divisors (see below), whose sum is σ = 3478052480. Its totient is φ = 2347685208.

The previous prime is 2891130971. The next prime is 2891131037. The reversal of 2891130991 is 1990311982.

2891130991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2891130991 - 2⁹ = 2891130479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891130911) 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, 10868781 + ... + 10869046.

It is an arithmetic number, because the mean of its divisors is an integer number (434756560).

Almost surely, 2^2891130991 is an apocalyptic number.

2891130991 is a deficient number, since it is larger than the sum of its proper divisors (586921489).

2891130991 is a wasteful number, since it uses less digits than its factorization.

2891130991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21737853.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 2891130991 is about 53769.2383338280. The cubic root of 2891130991 is about 1424.5879167122.

The spelling of 2891130991 in words is "two billion, eight hundred ninety-one million, one hundred thirty thousand, nine hundred ninety-one".