11512214491 has 4 divisors (see below), whose sum is σ = 11562486400. Its totient is φ = 11461942584.

The previous prime is 11512214471. The next prime is 11512214533. The reversal of 11512214491 is 19441221511.

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 11512214491 - 2¹¹ = 11512212443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11512214471) 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, 25135611 + ... + 25136068.

It is an arithmetic number, because the mean of its divisors is an integer number (2890621600).

Almost surely, 2^11512214491 is an apocalyptic number.

11512214491 is a deficient number, since it is larger than the sum of its proper divisors (50271909).

11512214491 is an equidigital number, since it uses as much as digits as its factorization.

11512214491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50271908.

The product of its digits is 2880, while the sum is 31.

The spelling of 11512214491 in words is "eleven billion, five hundred twelve million, two hundred fourteen thousand, four hundred ninety-one".