11513257971 has 4 divisors (see below), whose sum is σ = 15351010632. Its totient is φ = 7675505312.

The previous prime is 11513257969. The next prime is 11513258017. The reversal of 11513257971 is 17975231511.

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

It is a cyclic number.

It is not a de Polignac number, because 11513257971 - 2¹ = 11513257969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11513257901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918876326 + ... + 1918876331.

It is an arithmetic number, because the mean of its divisors is an integer number (3837752658).

Almost surely, 2^11513257971 is an apocalyptic number.

11513257971 is a deficient number, since it is larger than the sum of its proper divisors (3837752661).

11513257971 is an equidigital number, since it uses as much as digits as its factorization.

11513257971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837752660.

The product of its digits is 66150, while the sum is 42.

The spelling of 11513257971 in words is "eleven billion, five hundred thirteen million, two hundred fifty-seven thousand, nine hundred seventy-one".