68772181 has 2 divisors, whose sum is σ = 68772182. Its totient is φ = 68772180.

The previous prime is 68772163. The next prime is 68772227. The reversal of 68772181 is 18127786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 1285956 = 8215^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 68772181 - 2¹¹ = 68770133 is a prime.

It is a super-2 number, since 2×68772181² = 9459225758993522, 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 (68772101) 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, 34386090 + 34386091.

It is an arithmetic number, because the mean of its divisors is an integer number (34386091).

Almost surely, 2^68772181 is an apocalyptic number.

It is an amenable number.

68772181 is a deficient number, since it is larger than the sum of its proper divisors (1).

68772181 is an equidigital number, since it uses as much as digits as its factorization.

68772181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 68772181 is about 8292.8994326472. The cubic root of 68772181 is about 409.7046872058.

The spelling of 68772181 in words is "sixty-eight million, seven hundred seventy-two thousand, one hundred eighty-one".