1321045091 has 8 divisors (see below), whose sum is σ = 1438525200. Its totient is φ = 1208360160.

The previous prime is 1321045081. The next prime is 1321045109. The reversal of 1321045091 is 1905401231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321045091 - 2²⁶ = 1253936227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321045091.

It is not an unprimeable number, because it can be changed into a prime (1321045001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198220 + ... + 1199321.

It is an arithmetic number, because the mean of its divisors is an integer number (179815650).

Almost surely, 2^1321045091 is an apocalyptic number.

1321045091 is a deficient number, since it is larger than the sum of its proper divisors (117480109).

1321045091 is a wasteful number, since it uses less digits than its factorization.

1321045091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397589.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1321045091 is about 36346.1839950221. The cubic root of 1321045091 is about 1097.2507352267.

The spelling of 1321045091 in words is "one billion, three hundred twenty-one million, forty-five thousand, ninety-one".