43815231121 has 2 divisors, whose sum is σ = 43815231122. Its totient is φ = 43815231120.

The previous prime is 43815231113. The next prime is 43815231149. The reversal of 43815231121 is 12113251834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32865701521 + 10949529600 = 181289^2 + 104640^2 .

It is a cyclic number.

It is not a de Polignac number, because 43815231121 - 2³ = 43815231113 is a prime.

It is not a weakly prime, because it can be changed into another prime (43815231151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21907615560 + 21907615561.

It is an arithmetic number, because the mean of its divisors is an integer number (21907615561).

Almost surely, 2^43815231121 is an apocalyptic number.

It is an amenable number.

43815231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43815231121 is an equidigital number, since it uses as much as digits as its factorization.

43815231121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

Adding to 43815231121 its reverse (12113251834), we get a palindrome (55928482955).

The spelling of 43815231121 in words is "forty-three billion, eight hundred fifteen million, two hundred thirty-one thousand, one hundred twenty-one".