43605913381 has 2 divisors, whose sum is σ = 43605913382. Its totient is φ = 43605913380.

The previous prime is 43605913339. The next prime is 43605913409. The reversal of 43605913381 is 18331950634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42038941156 + 1566972225 = 205034^2 + 39585^2 .

It is a cyclic number.

It is not a de Polignac number, because 43605913381 - 2²⁹ = 43069042469 is a prime.

It is a super-2 number, since 2×43605913381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43605973381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21802956690 + 21802956691.

It is an arithmetic number, because the mean of its divisors is an integer number (21802956691).

Almost surely, 2^43605913381 is an apocalyptic number.

It is an amenable number.

43605913381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43605913381 is an equidigital number, since it uses as much as digits as its factorization.

43605913381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 43605913381 in words is "forty-three billion, six hundred five million, nine hundred thirteen thousand, three hundred eighty-one".