5218991 has 2 divisors, whose sum is σ = 5218992. Its totient is φ = 5218990.

The previous prime is 5218987. The next prime is 5219003. The reversal of 5218991 is 1998125.

5218991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5218991 - 2² = 5218987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5218951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2609495 + 2609496.

It is an arithmetic number, because the mean of its divisors is an integer number (2609496).

Almost surely, 2^5218991 is an apocalyptic number.

5218991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5218991 is an equidigital number, since it uses as much as digits as its factorization.

5218991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 5218991 is about 2284.5111074363. The cubic root of 5218991 is about 173.4584718465.

The spelling of 5218991 in words is "five million, two hundred eighteen thousand, nine hundred ninety-one".