43278791 has 2 divisors, whose sum is σ = 43278792. Its totient is φ = 43278790.

The previous prime is 43278779. The next prime is 43278797. The reversal of 43278791 is 19787234.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43278791 - 2¹⁴ = 43262407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43278797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21639395 + 21639396.

It is an arithmetic number, because the mean of its divisors is an integer number (21639396).

Almost surely, 2^43278791 is an apocalyptic number.

43278791 is a deficient number, since it is larger than the sum of its proper divisors (1).

43278791 is an equidigital number, since it uses as much as digits as its factorization.

43278791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 43278791 is about 6578.6617940125. The cubic root of 43278791 is about 351.0953196585.

The spelling of 43278791 in words is "forty-three million, two hundred seventy-eight thousand, seven hundred ninety-one".