68545181 has 2 divisors, whose sum is σ = 68545182. Its totient is φ = 68545180.

The previous prime is 68545177. The next prime is 68545189. The reversal of 68545181 is 18154586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 30525625 = 6166^2 + 5525^2 .

It is a cyclic number.

It is not a de Polignac number, because 68545181 - 2² = 68545177 is a prime.

It is a super-2 number, since 2×68545181² = 9396883676645522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68545189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34272590 + 34272591.

It is an arithmetic number, because the mean of its divisors is an integer number (34272591).

Almost surely, 2^68545181 is an apocalyptic number.

It is an amenable number.

68545181 is a deficient number, since it is larger than the sum of its proper divisors (1).

68545181 is an equidigital number, since it uses as much as digits as its factorization.

68545181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 38.

The square root of 68545181 is about 8279.2017127257. The cubic root of 68545181 is about 409.2534122993.

The spelling of 68545181 in words is "sixty-eight million, five hundred forty-five thousand, one hundred eighty-one".