67321993 has 2 divisors, whose sum is σ = 67321994. Its totient is φ = 67321992.

The previous prime is 67321973. The next prime is 67321999. The reversal of 67321993 is 39912376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64850809 + 2471184 = 8053^2 + 1572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67321993 is a prime.

It is equal to p_3969670 and since 67321993 and 3969670 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (67321999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33660996 + 33660997.

It is an arithmetic number, because the mean of its divisors is an integer number (33660997).

Almost surely, 2^67321993 is an apocalyptic number.

It is an amenable number.

67321993 is a deficient number, since it is larger than the sum of its proper divisors (1).

67321993 is an equidigital number, since it uses as much as digits as its factorization.

67321993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 67321993 is about 8204.9980499693. The cubic root of 67321993 is about 406.8044123391.

The spelling of 67321993 in words is "sixty-seven million, three hundred twenty-one thousand, nine hundred ninety-three".