1355445342509 has 2 divisors, whose sum is σ = 1355445342510. Its totient is φ = 1355445342508.

The previous prime is 1355445342463. The next prime is 1355445342521. The reversal of 1355445342509 is 9052435445531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1351355100484 + 4090242025 = 1162478^2 + 63955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355445342509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1355445302509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677722671254 + 677722671255.

It is an arithmetic number, because the mean of its divisors is an integer number (677722671255).

Almost surely, 2^{1355445342509} is an apocalyptic number.

It is an amenable number.

1355445342509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355445342509 is an equidigital number, since it uses as much as digits as its factorization.

1355445342509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 1355445342509 in words is "one trillion, three hundred fifty-five billion, four hundred forty-five million, three hundred forty-two thousand, five hundred nine".