6601549 has 2 divisors, whose sum is σ = 6601550. Its totient is φ = 6601548.

The previous prime is 6601523. The next prime is 6601561. The reversal of 6601549 is 9451066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3928324 + 2673225 = 1982^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601549 - 2¹³ = 6593357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6601549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601519) 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, 3300774 + 3300775.

It is an arithmetic number, because the mean of its divisors is an integer number (3300775).

Almost surely, 2^6601549 is an apocalyptic number.

It is an amenable number.

6601549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601549 is an equidigital number, since it uses as much as digits as its factorization.

6601549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6601549 is about 2569.3479717625. The cubic root of 6601549 is about 187.5924190316.

It can be divided in two parts, 660 and 1549, that added together give a square (2209 = 47²).

The spelling of 6601549 in words is "six million, six hundred one thousand, five hundred forty-nine".