1540043409109 has 2 divisors, whose sum is σ = 1540043409110. Its totient is φ = 1540043409108.

The previous prime is 1540043409103. The next prime is 1540043409143. The reversal of 1540043409109 is 9019043400451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1539845219025 + 198190084 = 1240905^2 + 14078^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540043409109 - 2⁵ = 1540043409077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540043409103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770021704554 + 770021704555.

It is an arithmetic number, because the mean of its divisors is an integer number (770021704555).

Almost surely, 2^{1540043409109} is an apocalyptic number.

It is an amenable number.

1540043409109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540043409109 is an equidigital number, since it uses as much as digits as its factorization.

1540043409109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 1540043409109 in words is "one trillion, five hundred forty billion, forty-three million, four hundred nine thousand, one hundred nine".