1329832561 has 4 divisors (see below), whose sum is σ = 1387651392. Its totient is φ = 1272013732.

The previous prime is 1329832481. The next prime is 1329832573. The reversal of 1329832561 is 1652389231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1329832561 - 2⁷ = 1329832433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329832661) 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, 28909381 + ... + 28909426.

It is an arithmetic number, because the mean of its divisors is an integer number (346912848).

Almost surely, 2^1329832561 is an apocalyptic number.

It is an amenable number.

1329832561 is a deficient number, since it is larger than the sum of its proper divisors (57818831).

1329832561 is an equidigital number, since it uses as much as digits as its factorization.

1329832561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57818830.

The product of its digits is 77760, while the sum is 40.

The square root of 1329832561 is about 36466.8693611064. The cubic root of 1329832561 is about 1099.6782973851.

The spelling of 1329832561 in words is "one billion, three hundred twenty-nine million, eight hundred thirty-two thousand, five hundred sixty-one".