1321051109 has 4 divisors (see below), whose sum is σ = 1509772704. Its totient is φ = 1132329516.

The previous prime is 1321051093. The next prime is 1321051111. The reversal of 1321051109 is 9011501231.

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 1321051109 - 2⁴ = 1321051093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321051159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94360787 + ... + 94360800.

It is an arithmetic number, because the mean of its divisors is an integer number (377443176).

Almost surely, 2^1321051109 is an apocalyptic number.

It is an amenable number.

1321051109 is a deficient number, since it is larger than the sum of its proper divisors (188721595).

1321051109 is an equidigital number, since it uses as much as digits as its factorization.

1321051109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188721594.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1321051109 is about 36346.2667821607. The cubic root of 1321051109 is about 1097.2524013936.

The spelling of 1321051109 in words is "one billion, three hundred twenty-one million, fifty-one thousand, one hundred nine".