6801521 has 2 divisors, whose sum is σ = 6801522. Its totient is φ = 6801520.

The previous prime is 6801499. The next prime is 6801523. The reversal of 6801521 is 1251086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4669921 + 2131600 = 2161^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 6801521 - 2²² = 2607217 is a prime.

Together with 6801523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6801523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3400760 + 3400761.

It is an arithmetic number, because the mean of its divisors is an integer number (3400761).

Almost surely, 2^6801521 is an apocalyptic number.

It is an amenable number.

6801521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6801521 is an equidigital number, since it uses as much as digits as its factorization.

6801521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 6801521 is about 2607.9725842117. The cubic root of 6801521 is about 189.4677718252.

The spelling of 6801521 in words is "six million, eight hundred one thousand, five hundred twenty-one".