5287991 has 2 divisors, whose sum is σ = 5287992. Its totient is φ = 5287990.

The previous prime is 5287981. The next prime is 5288033. The reversal of 5287991 is 1997825.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5287991 - 2¹⁸ = 5025847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5287921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2643995 + 2643996.

It is an arithmetic number, because the mean of its divisors is an integer number (2643996).

Almost surely, 2^5287991 is an apocalyptic number.

5287991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5287991 is an equidigital number, since it uses as much as digits as its factorization.

5287991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 5287991 is about 2299.5632193962. The cubic root of 5287991 is about 174.2195559355.

The spelling of 5287991 in words is "five million, two hundred eighty-seven thousand, nine hundred ninety-one".