43512705409 has 2 divisors, whose sum is σ = 43512705410. Its totient is φ = 43512705408.

The previous prime is 43512705403. The next prime is 43512705413. The reversal of 43512705409 is 90450721534.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37199608384 + 6313097025 = 192872^2 + 79455^2 .

It is a cyclic number.

It is not a de Polignac number, because 43512705409 - 2¹¹ = 43512703361 is a prime.

It is not a weakly prime, because it can be changed into another prime (43512705403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21756352704 + 21756352705.

It is an arithmetic number, because the mean of its divisors is an integer number (21756352705).

Almost surely, 2^43512705409 is an apocalyptic number.

It is an amenable number.

43512705409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43512705409 is an equidigital number, since it uses as much as digits as its factorization.

43512705409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 43512705409 in words is "forty-three billion, five hundred twelve million, seven hundred five thousand, four hundred nine".