43153809121 has 2 divisors, whose sum is σ = 43153809122. Its totient is φ = 43153809120.

The previous prime is 43153809019. The next prime is 43153809157. The reversal of 43153809121 is 12190835134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35398541025 + 7755268096 = 188145^2 + 88064^2 .

It is a cyclic number.

It is not a de Polignac number, because 43153809121 - 2⁷ = 43153808993 is a prime.

It is not a weakly prime, because it can be changed into another prime (43153809161) 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, 21576904560 + 21576904561.

It is an arithmetic number, because the mean of its divisors is an integer number (21576904561).

Almost surely, 2^43153809121 is an apocalyptic number.

It is an amenable number.

43153809121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43153809121 is an equidigital number, since it uses as much as digits as its factorization.

43153809121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 43153809121 in words is "forty-three billion, one hundred fifty-three million, eight hundred nine thousand, one hundred twenty-one".