678252181 has 2 divisors, whose sum is σ = 678252182. Its totient is φ = 678252180.

The previous prime is 678252161. The next prime is 678252187. The reversal of 678252181 is 181252876.

678252181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677769156 + 483025 = 26034^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 678252181 - 2⁵ = 678252149 is a prime.

It is a super-2 number, since 2×678252181² = 920052042062513522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678252187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339126090 + 339126091.

It is an arithmetic number, because the mean of its divisors is an integer number (339126091).

Almost surely, 2^678252181 is an apocalyptic number.

It is an amenable number.

678252181 is a deficient number, since it is larger than the sum of its proper divisors (1).

678252181 is an equidigital number, since it uses as much as digits as its factorization.

678252181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 678252181 is about 26043.2751588582. The cubic root of 678252181 is about 878.6118701131.

The spelling of 678252181 in words is "six hundred seventy-eight million, two hundred fifty-two thousand, one hundred eighty-one".