43697608081 has 2 divisors, whose sum is σ = 43697608082. Its totient is φ = 43697608080.

The previous prime is 43697608067. The next prime is 43697608139. The reversal of 43697608081 is 18080679634.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39577123600 + 4120484481 = 198940^2 + 64191^2 .

It is a cyclic number.

It is not a de Polignac number, because 43697608081 - 2¹³ = 43697599889 is a prime.

It is a super-2 number, since 2×43697608081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43697608051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21848804040 + 21848804041.

It is an arithmetic number, because the mean of its divisors is an integer number (21848804041).

Almost surely, 2^43697608081 is an apocalyptic number.

It is an amenable number.

43697608081 is a deficient number, since it is larger than the sum of its proper divisors (1).

43697608081 is an equidigital number, since it uses as much as digits as its factorization.

43697608081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 43697608081 in words is "forty-three billion, six hundred ninety-seven million, six hundred eight thousand, eighty-one".