67121917 has 4 divisors (see below), whose sum is σ = 67611996. Its totient is φ = 66631840.

The previous prime is 67121893. The next prime is 67121939. The reversal of 67121917 is 71912176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46090521 + 21031396 = 6789^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 67121917 - 2¹¹ = 67119869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67121947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244834 + ... + 245107.

It is an arithmetic number, because the mean of its divisors is an integer number (16902999).

Almost surely, 2^67121917 is an apocalyptic number.

It is an amenable number.

67121917 is a deficient number, since it is larger than the sum of its proper divisors (490079).

67121917 is a wasteful number, since it uses less digits than its factorization.

67121917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490078.

The product of its digits is 5292, while the sum is 34.

The square root of 67121917 is about 8192.7966531582. The cubic root of 67121917 is about 406.4010148781.

The spelling of 67121917 in words is "sixty-seven million, one hundred twenty-one thousand, nine hundred seventeen".