67797221 has 2 divisors, whose sum is σ = 67797222. Its totient is φ = 67797220.

The previous prime is 67797211. The next prime is 67797227. The reversal of 67797221 is 12279776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 3556996 = 8015^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 67797221 - 2²⁶ = 688357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67797227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33898610 + 33898611.

It is an arithmetic number, because the mean of its divisors is an integer number (33898611).

Almost surely, 2^67797221 is an apocalyptic number.

It is an amenable number.

67797221 is a deficient number, since it is larger than the sum of its proper divisors (1).

67797221 is an equidigital number, since it uses as much as digits as its factorization.

67797221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 67797221 is about 8233.9067883964. The cubic root of 67797221 is about 407.7593837086.

The spelling of 67797221 in words is "sixty-seven million, seven hundred ninety-seven thousand, two hundred twenty-one".