67108981 has 2 divisors, whose sum is σ = 67108982. Its totient is φ = 67108980.

The previous prime is 67108961. The next prime is 67109023. The reversal of 67108981 is 18980176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45346756 + 21762225 = 6734^2 + 4665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67108981 is a prime.

It is a super-2 number, since 2×67108981² = 9007230661716722, 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 (67108961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33554490 + 33554491.

It is an arithmetic number, because the mean of its divisors is an integer number (33554491).

Almost surely, 2^67108981 is an apocalyptic number.

It is an amenable number.

67108981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67108981 is an equidigital number, since it uses as much as digits as its factorization.

67108981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 67108981 is about 8192.0071411102. The cubic root of 67108981 is about 406.3749054664.

The spelling of 67108981 in words is "sixty-seven million, one hundred eight thousand, nine hundred eighty-one".