68439181 has 2 divisors, whose sum is σ = 68439182. Its totient is φ = 68439180.

The previous prime is 68439143. The next prime is 68439193. The reversal of 68439181 is 18193486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66683556 + 1755625 = 8166^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 68439181 - 2¹¹ = 68437133 is a prime.

It is a super-2 number, since 2×68439181² = 9367842991901522, 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 (68439281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34219590 + 34219591.

It is an arithmetic number, because the mean of its divisors is an integer number (34219591).

Almost surely, 2^68439181 is an apocalyptic number.

It is an amenable number.

68439181 is a deficient number, since it is larger than the sum of its proper divisors (1).

68439181 is an equidigital number, since it uses as much as digits as its factorization.

68439181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 68439181 is about 8272.7976525478. The cubic root of 68439181 is about 409.0423435217.

The spelling of 68439181 in words is "sixty-eight million, four hundred thirty-nine thousand, one hundred eighty-one".