67530521 has 2 divisors, whose sum is σ = 67530522. Its totient is φ = 67530520.

The previous prime is 67530517. The next prime is 67530523. The reversal of 67530521 is 12503576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 290521 = 8200^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 67530521 - 2² = 67530517 is a prime.

Together with 67530523, 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 (67530523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33765260 + 33765261.

It is an arithmetic number, because the mean of its divisors is an integer number (33765261).

Almost surely, 2^67530521 is an apocalyptic number.

It is an amenable number.

67530521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67530521 is an equidigital number, since it uses as much as digits as its factorization.

67530521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 67530521 is about 8217.6956015662. The cubic root of 67530521 is about 407.2240011977.

The spelling of 67530521 in words is "sixty-seven million, five hundred thirty thousand, five hundred twenty-one".