43311031091 has 2 divisors, whose sum is σ = 43311031092. Its totient is φ = 43311031090.

The previous prime is 43311031079. The next prime is 43311031109. The reversal of 43311031091 is 19013011334.

Together with next prime (43311031109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43311031091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43311031091.

It is not a weakly prime, because it can be changed into another prime (43311031391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21655515545 + 21655515546.

It is an arithmetic number, because the mean of its divisors is an integer number (21655515546).

Almost surely, 2^43311031091 is an apocalyptic number.

43311031091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43311031091 is an equidigital number, since it uses as much as digits as its factorization.

43311031091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 43311031091 in words is "forty-three billion, three hundred eleven million, thirty-one thousand, ninety-one".