67130521 has 2 divisors, whose sum is σ = 67130522. Its totient is φ = 67130520.

The previous prime is 67130519. The next prime is 67130551. The reversal of 67130521 is 12503176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 9066121 = 7620^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 67130521 - 2¹ = 67130519 is a prime.

Together with 67130519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67130551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33565260 + 33565261.

It is an arithmetic number, because the mean of its divisors is an integer number (33565261).

Almost surely, 2^67130521 is an apocalyptic number.

It is an amenable number.

67130521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67130521 is an equidigital number, since it uses as much as digits as its factorization.

67130521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 67130521 is about 8193.3217317520. The cubic root of 67130521 is about 406.4183789280.

Adding to 67130521 its reverse (12503176), we get a palindrome (79633697).

The spelling of 67130521 in words is "sixty-seven million, one hundred thirty thousand, five hundred twenty-one".