6986521 has 2 divisors, whose sum is σ = 6986522. Its totient is φ = 6986520.

The previous prime is 6986519. The next prime is 6986533. The reversal of 6986521 is 1256896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 38025 = 2636^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 6986521 - 2¹ = 6986519 is a prime.

It is a super-2 number, since 2×6986521² = 97622951366882, which contains 22 as substring.

Together with 6986519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6986591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3493260 + 3493261.

It is an arithmetic number, because the mean of its divisors is an integer number (3493261).

Almost surely, 2^6986521 is an apocalyptic number.

It is an amenable number.

6986521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6986521 is an equidigital number, since it uses as much as digits as its factorization.

6986521 is an evil number, because the sum of its binary digits is even.

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

The square root of 6986521 is about 2643.2027920687. The cubic root of 6986521 is about 191.1702565294.

The spelling of 6986521 in words is "six million, nine hundred eighty-six thousand, five hundred twenty-one".