43509797 has 2 divisors, whose sum is σ = 43509798. Its totient is φ = 43509796.

The previous prime is 43509769. The next prime is 43509799. The reversal of 43509797 is 79790534.

It is a happy number.

43509797 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., 39513796 + 3996001 = 6286^2 + 1999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43509797 is a prime.

Together with 43509799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43509799) 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, 21754898 + 21754899.

It is an arithmetic number, because the mean of its divisors is an integer number (21754899).

Almost surely, 2^43509797 is an apocalyptic number.

It is an amenable number.

43509797 is a deficient number, since it is larger than the sum of its proper divisors (1).

43509797 is an equidigital number, since it uses as much as digits as its factorization.

43509797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 43509797 is about 6596.1956459766. The cubic root of 43509797 is about 351.7188833564.

The spelling of 43509797 in words is "forty-three million, five hundred nine thousand, seven hundred ninety-seven".