67163981 has 2 divisors, whose sum is σ = 67163982. Its totient is φ = 67163980.

The previous prime is 67163977. The next prime is 67164001. The reversal of 67163981 is 18936176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62173225 + 4990756 = 7885^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 67163981 - 2² = 67163977 is a prime.

It is a super-2 number, since 2×67163981² = 9022000687536722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67163911) 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, 33581990 + 33581991.

It is an arithmetic number, because the mean of its divisors is an integer number (33581991).

Almost surely, 2^67163981 is an apocalyptic number.

It is an amenable number.

67163981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67163981 is an equidigital number, since it uses as much as digits as its factorization.

67163981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 67163981 is about 8195.3633842558. The cubic root of 67163981 is about 406.4858916878.

The spelling of 67163981 in words is "sixty-seven million, one hundred sixty-three thousand, nine hundred eighty-one".