1321179389 has 16 divisors (see below), whose sum is σ = 1381406400. Its totient is φ = 1262666496.

The previous prime is 1321179373. The next prime is 1321179407. The reversal of 1321179389 is 9839711231.

It is a cyclic number.

It is not a de Polignac number, because 1321179389 - 2⁴ = 1321179373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321179319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351482 + ... + 355220.

It is an arithmetic number, because the mean of its divisors is an integer number (86337900).

Almost surely, 2^1321179389 is an apocalyptic number.

It is an amenable number.

1321179389 is a deficient number, since it is larger than the sum of its proper divisors (60227011).

1321179389 is a wasteful number, since it uses less digits than its factorization.

1321179389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964.

The product of its digits is 81648, while the sum is 44.

The square root of 1321179389 is about 36348.0314322523. The cubic root of 1321179389 is about 1097.2879162906.

The spelling of 1321179389 in words is "one billion, three hundred twenty-one million, one hundred seventy-nine thousand, three hundred eighty-nine".