1409969217509 has 2 divisors, whose sum is σ = 1409969217510. Its totient is φ = 1409969217508.

The previous prime is 1409969217497. The next prime is 1409969217533. The reversal of 1409969217509 is 9057129699041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1366911722500 + 43057495009 = 1169150^2 + 207503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1409969217509 - 2²⁴ = 1409952440293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1409969217589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704984608754 + 704984608755.

It is an arithmetic number, because the mean of its divisors is an integer number (704984608755).

Almost surely, 2^{1409969217509} is an apocalyptic number.

It is an amenable number.

1409969217509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1409969217509 is an equidigital number, since it uses as much as digits as its factorization.

1409969217509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The spelling of 1409969217509 in words is "one trillion, four hundred nine billion, nine hundred sixty-nine million, two hundred seventeen thousand, five hundred nine".