67874921 has 2 divisors, whose sum is σ = 67874922. Its totient is φ = 67874920.

The previous prime is 67874893. The next prime is 67874959. The reversal of 67874921 is 12947876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 11999296 = 7475^2 + 3464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67874921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67874621) 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 as a sum of consecutive naturals, namely, 33937460 + 33937461.

It is an arithmetic number, because the mean of its divisors is an integer number (33937461).

Almost surely, 2^67874921 is an apocalyptic number.

It is an amenable number.

67874921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67874921 is an equidigital number, since it uses as much as digits as its factorization.

67874921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 67874921 is about 8238.6237321533. The cubic root of 67874921 is about 407.9150971129.

The spelling of 67874921 in words is "sixty-seven million, eight hundred seventy-four thousand, nine hundred twenty-one".