1321888089 has 4 divisors (see below), whose sum is σ = 1762517456. Its totient is φ = 881258724.

The previous prime is 1321888031. The next prime is 1321888123. The reversal of 1321888089 is 9808881231.

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 de Polignac number, because none of the positive numbers 2^k-1321888089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321888289) 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, 220314679 + ... + 220314684.

It is an arithmetic number, because the mean of its divisors is an integer number (440629364).

Almost surely, 2^1321888089 is an apocalyptic number.

It is an amenable number.

1321888089 is a deficient number, since it is larger than the sum of its proper divisors (440629367).

1321888089 is an equidigital number, since it uses as much as digits as its factorization.

1321888089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440629366.

The product of its (nonzero) digits is 221184, while the sum is 48.

The square root of 1321888089 is about 36357.7789338128. The cubic root of 1321888089 is about 1097.4840816630.

The spelling of 1321888089 in words is "one billion, three hundred twenty-one million, eight hundred eighty-eight thousand, eighty-nine".