43278287231 has 2 divisors, whose sum is σ = 43278287232. Its totient is φ = 43278287230.

The previous prime is 43278287219. The next prime is 43278287291. The reversal of 43278287231 is 13278287234.

43278287231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43278287231 is a prime.

It is a super-2 number, since 2×43278287231² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43278287291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21639143615 + 21639143616.

It is an arithmetic number, because the mean of its divisors is an integer number (21639143616).

Almost surely, 2^43278287231 is an apocalyptic number.

43278287231 is a deficient number, since it is larger than the sum of its proper divisors (1).

43278287231 is an equidigital number, since it uses as much as digits as its factorization.

43278287231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 47.

The spelling of 43278287231 in words is "forty-three billion, two hundred seventy-eight million, two hundred eighty-seven thousand, two hundred thirty-one".