1305320520099 has 4 divisors (see below), whose sum is σ = 1740427360136. Its totient is φ = 870213680064.

The previous prime is 1305320520089. The next prime is 1305320520107. The reversal of 1305320520099 is 9900250235031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1305320520099 - 2⁵ = 1305320520067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305320520089) 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, 217553420014 + ... + 217553420019.

It is an arithmetic number, because the mean of its divisors is an integer number (435106840034).

Almost surely, 2^{1305320520099} is an apocalyptic number.

1305320520099 is a deficient number, since it is larger than the sum of its proper divisors (435106840037).

1305320520099 is an equidigital number, since it uses as much as digits as its factorization.

1305320520099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435106840036.

The product of its (nonzero) digits is 72900, while the sum is 39.

The spelling of 1305320520099 in words is "one trillion, three hundred five billion, three hundred twenty million, five hundred twenty thousand, ninety-nine".