1321312045 has 8 divisors (see below), whose sum is σ = 1607295096. Its totient is φ = 1042569216.

The previous prime is 1321312009. The next prime is 1321312049. The reversal of 1321312045 is 5402131231.

It is a happy number.

1321312045 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 172712164 + 1148599881 = 13142^2 + 33891^2 .

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 1321312045 - 2¹³ = 1321303853 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 (1321312049) 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, 1809652 + ... + 1810381.

It is an arithmetic number, because the mean of its divisors is an integer number (200911887).

Almost surely, 2^1321312045 is an apocalyptic number.

It is an amenable number.

1321312045 is a deficient number, since it is larger than the sum of its proper divisors (285983051).

1321312045 is an equidigital number, since it uses as much as digits as its factorization.

1321312045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620111.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1321312045 is about 36349.8561895367. The cubic root of 1321312045 is about 1097.3246402852.

Adding to 1321312045 its reverse (5402131231), we get a palindrome (6723443276).

The spelling of 1321312045 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, forty-five".