43709720749 has 2 divisors, whose sum is σ = 43709720750. Its totient is φ = 43709720748.

The previous prime is 43709720729. The next prime is 43709720753. The reversal of 43709720749 is 94702790734.

43709720749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42042631849 + 1667088900 = 205043^2 + 40830^2 .

It is a cyclic number.

It is not a de Polignac number, because 43709720749 - 2²⁷ = 43575503021 is a prime.

It is a super-2 number, since 2×43709720749² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43709720696 and 43709720705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43709720729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21854860374 + 21854860375.

It is an arithmetic number, because the mean of its divisors is an integer number (21854860375).

Almost surely, 2^43709720749 is an apocalyptic number.

It is an amenable number.

43709720749 is a deficient number, since it is larger than the sum of its proper divisors (1).

43709720749 is an equidigital number, since it uses as much as digits as its factorization.

43709720749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 52.

The spelling of 43709720749 in words is "forty-three billion, seven hundred nine million, seven hundred twenty thousand, seven hundred forty-nine".