43016531561 has 2 divisors, whose sum is σ = 43016531562. Its totient is φ = 43016531560.

The previous prime is 43016531489. The next prime is 43016531567. The reversal of 43016531561 is 16513561034.

43016531561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43014760000 + 1771561 = 207400^2 + 1331^2 .

It is a cyclic number.

It is not a de Polignac number, because 43016531561 - 2²⁶ = 42949422697 is a prime.

It is not a weakly prime, because it can be changed into another prime (43016531567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21508265780 + 21508265781.

It is an arithmetic number, because the mean of its divisors is an integer number (21508265781).

Almost surely, 2^43016531561 is an apocalyptic number.

It is an amenable number.

43016531561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43016531561 is an equidigital number, since it uses as much as digits as its factorization.

43016531561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 43016531561 in words is "forty-three billion, sixteen million, five hundred thirty-one thousand, five hundred sixty-one".