67961009 has 2 divisors, whose sum is σ = 67961010. Its totient is φ = 67961008.

The previous prime is 67960939. The next prime is 67961051. The reversal of 67961009 is 90016976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 9591409 = 7640^2 + 3097^2 .

It is a cyclic number.

It is not a de Polignac number, because 67961009 - 2¹² = 67956913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67961059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33980504 + 33980505.

It is an arithmetic number, because the mean of its divisors is an integer number (33980505).

Almost surely, 2^67961009 is an apocalyptic number.

It is an amenable number.

67961009 is a deficient number, since it is larger than the sum of its proper divisors (1).

67961009 is an equidigital number, since it uses as much as digits as its factorization.

67961009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 67961009 is about 8243.8467355962. The cubic root of 67961009 is about 408.0874816417.

The spelling of 67961009 in words is "sixty-seven million, nine hundred sixty-one thousand, nine".