43181234278891 has 2 divisors, whose sum is σ = 43181234278892. Its totient is φ = 43181234278890.

The previous prime is 43181234278877. The next prime is 43181234278909. The reversal of 43181234278891 is 19887243218134.

It is a happy number.

43181234278891 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 not a de Polignac number, because 43181234278891 - 2⁵ = 43181234278859 is a prime.

It is a super-2 number, since 2×43181234278891² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43181234278801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21590617139445 + 21590617139446.

It is an arithmetic number, because the mean of its divisors is an integer number (21590617139446).

Almost surely, 2^{43181234278891} is an apocalyptic number.

43181234278891 is a deficient number, since it is larger than the sum of its proper divisors (1).

43181234278891 is an equidigital number, since it uses as much as digits as its factorization.

43181234278891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18579456, while the sum is 61.

The spelling of 43181234278891 in words is "forty-three trillion, one hundred eighty-one billion, two hundred thirty-four million, two hundred seventy-eight thousand, eight hundred ninety-one".