1355287789 has 4 divisors (see below), whose sum is σ = 1355755324. Its totient is φ = 1354820256.

The previous prime is 1355287777. The next prime is 1355287793. The reversal of 1355287789 is 9877825531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 855094564 + 500193225 = 29242^2 + 22365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355287789 - 2⁵ = 1355287757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355267789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229392 + ... + 235225.

It is an arithmetic number, because the mean of its divisors is an integer number (338938831).

Almost surely, 2^1355287789 is an apocalyptic number.

It is an amenable number.

1355287789 is a deficient number, since it is larger than the sum of its proper divisors (467535).

1355287789 is an equidigital number, since it uses as much as digits as its factorization.

1355287789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467534.

The product of its digits is 4233600, while the sum is 55.

The square root of 1355287789 is about 36814.2335109669. The cubic root of 1355287789 is about 1106.6505608755.

The spelling of 1355287789 in words is "one billion, three hundred fifty-five million, two hundred eighty-seven thousand, seven hundred eighty-nine".