43158008521 has 2 divisors, whose sum is σ = 43158008522. Its totient is φ = 43158008520.

The previous prime is 43158008503. The next prime is 43158008549. The reversal of 43158008521 is 12580085134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22041559296 + 21116449225 = 148464^2 + 145315^2 .

It is a cyclic number.

It is not a de Polignac number, because 43158008521 - 2⁹ = 43158008009 is a prime.

It is a super-2 number, since 2×43158008521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43158008561) 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, 21579004260 + 21579004261.

It is an arithmetic number, because the mean of its divisors is an integer number (21579004261).

Almost surely, 2^43158008521 is an apocalyptic number.

It is an amenable number.

43158008521 is a deficient number, since it is larger than the sum of its proper divisors (1).

43158008521 is an equidigital number, since it uses as much as digits as its factorization.

43158008521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 43158008521 in words is "forty-three billion, one hundred fifty-eight million, eight thousand, five hundred twenty-one".