1355809745 has 4 divisors (see below), whose sum is σ = 1626971700. Its totient is φ = 1084647792.

The previous prime is 1355809739. The next prime is 1355809757. The reversal of 1355809745 is 5479085531.

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 588353536 + 767456209 = 24256^2 + 27703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355809745 - 2²⁰ = 1354761169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1355809745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135580970 + ... + 135580979.

It is an arithmetic number, because the mean of its divisors is an integer number (406742925).

Almost surely, 2^1355809745 is an apocalyptic number.

It is an amenable number.

1355809745 is a deficient number, since it is larger than the sum of its proper divisors (271161955).

1355809745 is an equidigital number, since it uses as much as digits as its factorization.

1355809745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271161954.

The product of its (nonzero) digits is 756000, while the sum is 47.

The square root of 1355809745 is about 36821.3218801281. The cubic root of 1355809745 is about 1106.7926091224.

The spelling of 1355809745 in words is "one billion, three hundred fifty-five million, eight hundred nine thousand, seven hundred forty-five".