6696521 has 16 divisors (see below), whose sum is σ = 7724304. Its totient is φ = 5750784.

The previous prime is 6696517. The next prime is 6696553. The reversal of 6696521 is 1256966.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 546121 + 6150400 = 739^2 + 2480^2 .

It is not a de Polignac number, because 6696521 - 2² = 6696517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6696581) 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 in 15 ways as a sum of consecutive naturals, for example, 34601 + ... + 34793.

It is an arithmetic number, because the mean of its divisors is an integer number (482769).

Almost surely, 2^6696521 is an apocalyptic number.

It is an amenable number.

6696521 is a deficient number, since it is larger than the sum of its proper divisors (1027783).

6696521 is a wasteful number, since it uses less digits than its factorization.

6696521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 19440, while the sum is 35.

The square root of 6696521 is about 2587.7637063689. The cubic root of 6696521 is about 188.4877274854.

The spelling of 6696521 in words is "six million, six hundred ninety-six thousand, five hundred twenty-one".