67331309 has 2 divisors, whose sum is σ = 67331310. Its totient is φ = 67331308.

The previous prime is 67331293. The next prime is 67331311. The reversal of 67331309 is 90313376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 27008809 = 6350^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 67331309 - 2⁴ = 67331293 is a prime.

Together with 67331311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67331609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33665654 + 33665655.

It is an arithmetic number, because the mean of its divisors is an integer number (33665655).

Almost surely, 2^67331309 is an apocalyptic number.

It is an amenable number.

67331309 is a deficient number, since it is larger than the sum of its proper divisors (1).

67331309 is an equidigital number, since it uses as much as digits as its factorization.

67331309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 32.

The square root of 67331309 is about 8205.5657330863. The cubic root of 67331309 is about 406.8231759702.

The spelling of 67331309 in words is "sixty-seven million, three hundred thirty-one thousand, three hundred nine".