68170981 has 2 divisors, whose sum is σ = 68170982. Its totient is φ = 68170980.

The previous prime is 68170961. The next prime is 68171023. The reversal of 68170981 is 18907186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 6548481 = 7850^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 68170981 - 2²¹ = 66073829 is a prime.

It is a super-2 number, since 2×68170981² = 9294565301004722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68170951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34085490 + 34085491.

It is an arithmetic number, because the mean of its divisors is an integer number (34085491).

Almost surely, 2^68170981 is an apocalyptic number.

It is an amenable number.

68170981 is a deficient number, since it is larger than the sum of its proper divisors (1).

68170981 is an equidigital number, since it uses as much as digits as its factorization.

68170981 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 68170981 is about 8256.5719884223. The cubic root of 68170981 is about 408.5073245836.

The spelling of 68170981 in words is "sixty-eight million, one hundred seventy thousand, nine hundred eighty-one".