67981933 has 2 divisors, whose sum is σ = 67981934. Its totient is φ = 67981932.

The previous prime is 67981909. The next prime is 67981937. The reversal of 67981933 is 33918976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41951529 + 26030404 = 6477^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 67981933 - 2⁹ = 67981421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67981937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33990966 + 33990967.

It is an arithmetic number, because the mean of its divisors is an integer number (33990967).

Almost surely, 2^67981933 is an apocalyptic number.

It is an amenable number.

67981933 is a deficient number, since it is larger than the sum of its proper divisors (1).

67981933 is an equidigital number, since it uses as much as digits as its factorization.

67981933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 67981933 is about 8245.1157056769. The cubic root of 67981933 is about 408.1293583316.

The spelling of 67981933 in words is "sixty-seven million, nine hundred eighty-one thousand, nine hundred thirty-three".