8667521 has 2 divisors, whose sum is σ = 8667522. Its totient is φ = 8667520.

The previous prime is 8667511. The next prime is 8667539. The reversal of 8667521 is 1257668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8473921 + 193600 = 2911^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 8667521 - 2⁶ = 8667457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8667511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333760 + 4333761.

It is an arithmetic number, because the mean of its divisors is an integer number (4333761).

Almost surely, 2^8667521 is an apocalyptic number.

It is an amenable number.

8667521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8667521 is an equidigital number, since it uses as much as digits as its factorization.

8667521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 8667521 is about 2944.0653865021. The cubic root of 8667521 is about 205.4147541996.

The spelling of 8667521 in words is "eight million, six hundred sixty-seven thousand, five hundred twenty-one".