43612612609 has 2 divisors, whose sum is σ = 43612612610. Its totient is φ = 43612612608.

The previous prime is 43612612607. The next prime is 43612612691. The reversal of 43612612609 is 90621621634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43410972609 + 201640000 = 208353^2 + 14200^2 .

It is a cyclic number.

It is not a de Polignac number, because 43612612609 - 2¹ = 43612612607 is a prime.

Together with 43612612607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43612612607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21806306304 + 21806306305.

It is an arithmetic number, because the mean of its divisors is an integer number (21806306305).

Almost surely, 2^43612612609 is an apocalyptic number.

It is an amenable number.

43612612609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43612612609 is an equidigital number, since it uses as much as digits as its factorization.

43612612609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 43612612609 in words is "forty-three billion, six hundred twelve million, six hundred twelve thousand, six hundred nine".