1355445689 has 4 divisors (see below), whose sum is σ = 1459710756. Its totient is φ = 1251180624.

The previous prime is 1355445671. The next prime is 1355445697. The reversal of 1355445689 is 9865445531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9865445531 = 37 ⋅266633663.

It can be written as a sum of positive squares in 2 ways, for example, as 87516025 + 1267929664 = 9355^2 + 35608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355445689 - 2⁸ = 1355445433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355445659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52132514 + ... + 52132539.

It is an arithmetic number, because the mean of its divisors is an integer number (364927689).

Almost surely, 2^1355445689 is an apocalyptic number.

It is an amenable number.

1355445689 is a deficient number, since it is larger than the sum of its proper divisors (104265067).

1355445689 is a wasteful number, since it uses less digits than its factorization.

1355445689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104265066.

The product of its digits is 2592000, while the sum is 50.

The square root of 1355445689 is about 36816.3779994719. The cubic root of 1355445689 is about 1106.6935365788.

The spelling of 1355445689 in words is "one billion, three hundred fifty-five million, four hundred forty-five thousand, six hundred eighty-nine".