43439020549 has 2 divisors, whose sum is σ = 43439020550. Its totient is φ = 43439020548.

The previous prime is 43439020531. The next prime is 43439020589. The reversal of 43439020549 is 94502093434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42627796225 + 811224324 = 206465^2 + 28482^2 .

It is a cyclic number.

It is not a de Polignac number, because 43439020549 - 2²³ = 43430631941 is a prime.

It is a super-2 number, since 2×43439020549² (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 (43439020589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21719510274 + 21719510275.

It is an arithmetic number, because the mean of its divisors is an integer number (21719510275).

Almost surely, 2^43439020549 is an apocalyptic number.

It is an amenable number.

43439020549 is a deficient number, since it is larger than the sum of its proper divisors (1).

43439020549 is an equidigital number, since it uses as much as digits as its factorization.

43439020549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 43439020549 in words is "forty-three billion, four hundred thirty-nine million, twenty thousand, five hundred forty-nine".