6896521 has 4 divisors (see below), whose sum is σ = 6974100. Its totient is φ = 6818944.

The previous prime is 6896507. The next prime is 6896531. The reversal of 6896521 is 1256986.

6896521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1256986 = 2 ⋅628493.

It can be written as a sum of positive squares in 2 ways, for example, as 546121 + 6350400 = 739^2 + 2520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6896521 - 2⁵ = 6896489 is a prime.

It is an Ulam number.

It is a Duffinian number.

6896521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6896501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38656 + ... + 38833.

It is an arithmetic number, because the mean of its divisors is an integer number (1743525).

Almost surely, 2^6896521 is an apocalyptic number.

It is an amenable number.

6896521 is a deficient number, since it is larger than the sum of its proper divisors (77579).

6896521 is an equidigital number, since it uses as much as digits as its factorization.

6896521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77578.

The product of its digits is 25920, while the sum is 37.

The square root of 6896521 is about 2626.1228074864. The cubic root of 6896521 is about 190.3458244667.

It can be divided in two parts, 68965 and 21, that added together give a palindrome (68986).

The spelling of 6896521 in words is "six million, eight hundred ninety-six thousand, five hundred twenty-one".