43243257389 has 2 divisors, whose sum is σ = 43243257390. Its totient is φ = 43243257388.

The previous prime is 43243257361. The next prime is 43243257443. The reversal of 43243257389 is 98375234234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36583065289 + 6660192100 = 191267^2 + 81610^2 .

It is a cyclic number.

It is not a de Polignac number, because 43243257389 - 2²⁸ = 42974821933 is a prime.

It is a super-2 number, since 2×43243257389² (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 (43243257349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621628694 + 21621628695.

It is an arithmetic number, because the mean of its divisors is an integer number (21621628695).

Almost surely, 2^43243257389 is an apocalyptic number.

It is an amenable number.

43243257389 is a deficient number, since it is larger than the sum of its proper divisors (1).

43243257389 is an equidigital number, since it uses as much as digits as its factorization.

43243257389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 50.

The spelling of 43243257389 in words is "forty-three billion, two hundred forty-three million, two hundred fifty-seven thousand, three hundred eighty-nine".