43919118409 has 2 divisors, whose sum is σ = 43919118410. Its totient is φ = 43919118408.

The previous prime is 43919118377. The next prime is 43919118413. The reversal of 43919118409 is 90481191934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32773671225 + 11145447184 = 181035^2 + 105572^2 .

It is a cyclic number.

It is not a de Polignac number, because 43919118409 - 2⁵ = 43919118377 is a prime.

It is not a weakly prime, because it can be changed into another prime (43919118709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21959559204 + 21959559205.

It is an arithmetic number, because the mean of its divisors is an integer number (21959559205).

Almost surely, 2^43919118409 is an apocalyptic number.

It is an amenable number.

43919118409 is a deficient number, since it is larger than the sum of its proper divisors (1).

43919118409 is an equidigital number, since it uses as much as digits as its factorization.

43919118409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 43919118409 in words is "forty-three billion, nine hundred nineteen million, one hundred eighteen thousand, four hundred nine".