43278061 has 2 divisors, whose sum is σ = 43278062. Its totient is φ = 43278060.

The previous prime is 43278041. The next prime is 43278089. The reversal of 43278061 is 16087234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42653961 + 624100 = 6531^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 43278061 - 2⁷ = 43277933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43278031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21639030 + 21639031.

It is an arithmetic number, because the mean of its divisors is an integer number (21639031).

Almost surely, 2^43278061 is an apocalyptic number.

It is an amenable number.

43278061 is a deficient number, since it is larger than the sum of its proper divisors (1).

43278061 is an equidigital number, since it uses as much as digits as its factorization.

43278061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 43278061 is about 6578.6063113702. The cubic root of 43278061 is about 351.0933456275.

The spelling of 43278061 in words is "forty-three million, two hundred seventy-eight thousand, sixty-one".