5811340991 has 4 divisors (see below), whose sum is σ = 5934986592. Its totient is φ = 5687695392.

The previous prime is 5811340981. The next prime is 5811340993. The reversal of 5811340991 is 1990431185.

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

It is a cyclic number.

It is not a de Polignac number, because 5811340991 - 2²² = 5807146687 is a prime.

It is a super-2 number, since 2×5811340991² = 67543368227353724162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5811340993) 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, 61822730 + ... + 61822823.

It is an arithmetic number, because the mean of its divisors is an integer number (1483746648).

Almost surely, 2^5811340991 is an apocalyptic number.

5811340991 is a deficient number, since it is larger than the sum of its proper divisors (123645601).

5811340991 is a wasteful number, since it uses less digits than its factorization.

5811340991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123645600.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 5811340991 is about 76232.1519504730. The cubic root of 5811340991 is about 1797.8720729463.

The spelling of 5811340991 in words is "five billion, eight hundred eleven million, three hundred forty thousand, nine hundred ninety-one".