11515320397 has 4 divisors (see below), whose sum is σ = 13160366176. Its totient is φ = 9870274620.

The previous prime is 11515320389. The next prime is 11515320403. The reversal of 11515320397 is 79302351511.

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 11515320397 - 2³ = 11515320389 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 (11515320697) 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, 822522879 + ... + 822522892.

It is an arithmetic number, because the mean of its divisors is an integer number (3290091544).

Almost surely, 2^11515320397 is an apocalyptic number.

It is an amenable number.

11515320397 is a deficient number, since it is larger than the sum of its proper divisors (1645045779).

11515320397 is an equidigital number, since it uses as much as digits as its factorization.

11515320397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645045778.

The product of its (nonzero) digits is 28350, while the sum is 37.

The spelling of 11515320397 in words is "eleven billion, five hundred fifteen million, three hundred twenty thousand, three hundred ninety-seven".