6525991 has 2 divisors, whose sum is σ = 6525992. Its totient is φ = 6525990.

The previous prime is 6525979. The next prime is 6526033. The reversal of 6525991 is 1995256.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6525991 - 2¹¹ = 6523943 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6525991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6525901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3262995 + 3262996.

It is an arithmetic number, because the mean of its divisors is an integer number (3262996).

Almost surely, 2^6525991 is an apocalyptic number.

6525991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6525991 is an equidigital number, since it uses as much as digits as its factorization.

6525991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 6525991 is about 2554.6019259368. The cubic root of 6525991 is about 186.8739749686.

The spelling of 6525991 in words is "six million, five hundred twenty-five thousand, nine hundred ninety-one".