43509775121 has 2 divisors, whose sum is σ = 43509775122. Its totient is φ = 43509775120.

The previous prime is 43509775091. The next prime is 43509775139. The reversal of 43509775121 is 12157790534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41733995521 + 1775779600 = 204289^2 + 42140^2 .

It is a cyclic number.

It is not a de Polignac number, because 43509775121 - 2¹⁴ = 43509758737 is a prime.

It is not a weakly prime, because it can be changed into another prime (43509775171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21754887560 + 21754887561.

It is an arithmetic number, because the mean of its divisors is an integer number (21754887561).

Almost surely, 2^43509775121 is an apocalyptic number.

It is an amenable number.

43509775121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43509775121 is an equidigital number, since it uses as much as digits as its factorization.

43509775121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 43509775121 in words is "forty-three billion, five hundred nine million, seven hundred seventy-five thousand, one hundred twenty-one".