5851991 has 2 divisors, whose sum is σ = 5851992. Its totient is φ = 5851990.

The previous prime is 5851969. The next prime is 5852009. The reversal of 5851991 is 1991585.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5851991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5851921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2925995 + 2925996.

It is an arithmetic number, because the mean of its divisors is an integer number (2925996).

Almost surely, 2^5851991 is an apocalyptic number.

5851991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5851991 is an equidigital number, since it uses as much as digits as its factorization.

5851991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 38.

The square root of 5851991 is about 2419.0888780696. The cubic root of 5851991 is about 180.2054341729.

The spelling of 5851991 in words is "five million, eight hundred fifty-one thousand, nine hundred ninety-one".