43861509697 has 2 divisors, whose sum is σ = 43861509698. Its totient is φ = 43861509696.

The previous prime is 43861509691. The next prime is 43861509793. The reversal of 43861509697 is 79690516834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31289718321 + 12571791376 = 176889^2 + 112124^2 .

It is a cyclic number.

It is not a de Polignac number, because 43861509697 - 2⁷ = 43861509569 is a prime.

It is not a weakly prime, because it can be changed into another prime (43861509691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21930754848 + 21930754849.

It is an arithmetic number, because the mean of its divisors is an integer number (21930754849).

Almost surely, 2^43861509697 is an apocalyptic number.

It is an amenable number.

43861509697 is a deficient number, since it is larger than the sum of its proper divisors (1).

43861509697 is an equidigital number, since it uses as much as digits as its factorization.

43861509697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 43861509697 in words is "forty-three billion, eight hundred sixty-one million, five hundred nine thousand, six hundred ninety-seven".