67213609 has 2 divisors, whose sum is σ = 67213610. Its totient is φ = 67213608.

The previous prime is 67213603. The next prime is 67213669. The reversal of 67213609 is 90631276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46963609 + 20250000 = 6853^2 + 4500^2 .

It is a cyclic number.

It is not a de Polignac number, because 67213609 - 2²³ = 58825001 is a prime.

It is not a weakly prime, because it can be changed into another prime (67213603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33606804 + 33606805.

It is an arithmetic number, because the mean of its divisors is an integer number (33606805).

Almost surely, 2^67213609 is an apocalyptic number.

It is an amenable number.

67213609 is a deficient number, since it is larger than the sum of its proper divisors (1).

67213609 is an equidigital number, since it uses as much as digits as its factorization.

67213609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 67213609 is about 8198.3906347527. The cubic root of 67213609 is about 406.5859855918.

The spelling of 67213609 in words is "sixty-seven million, two hundred thirteen thousand, six hundred nine".