1355445342521 has 2 divisors, whose sum is σ = 1355445342522. Its totient is φ = 1355445342520.

The previous prime is 1355445342509. The next prime is 1355445342527. The reversal of 1355445342521 is 1252435445531.

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., 1351961982121 + 3483360400 = 1162739^2 + 59020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355445342521 - 2³⁰ = 1354371600697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1355445342527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677722671260 + 677722671261.

It is an arithmetic number, because the mean of its divisors is an integer number (677722671261).

Almost surely, 2^{1355445342521} is an apocalyptic number.

It is an amenable number.

1355445342521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355445342521 is an equidigital number, since it uses as much as digits as its factorization.

1355445342521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440000, while the sum is 44.

The spelling of 1355445342521 in words is "one trillion, three hundred fifty-five billion, four hundred forty-five million, three hundred forty-two thousand, five hundred twenty-one".