1331705609 has 4 divisors (see below), whose sum is σ = 1434144516. Its totient is φ = 1229266704.

The previous prime is 1331705581. The next prime is 1331705621. The reversal of 1331705609 is 9065071331.

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 529230025 + 802475584 = 23005^2 + 28328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331705609 - 2²⁰ = 1330657033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331705689) 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, 51219434 + ... + 51219459.

It is an arithmetic number, because the mean of its divisors is an integer number (358536129).

Almost surely, 2^1331705609 is an apocalyptic number.

It is an amenable number.

1331705609 is a deficient number, since it is larger than the sum of its proper divisors (102438907).

1331705609 is a wasteful number, since it uses less digits than its factorization.

1331705609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102438906.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 1331705609 is about 36492.5418270638. The cubic root of 1331705609 is about 1100.1943483051.

The spelling of 1331705609 in words is "one billion, three hundred thirty-one million, seven hundred five thousand, six hundred nine".