131216511 has 4 divisors (see below), whose sum is σ = 174955352. Its totient is φ = 87477672.

The previous prime is 131216471. The next prime is 131216537. The reversal of 131216511 is 115612131.

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 131216511 - 2¹¹ = 131214463 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 (131216581) 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 3 ways as a sum of consecutive naturals, for example, 21869416 + ... + 21869421.

It is an arithmetic number, because the mean of its divisors is an integer number (43738838).

Almost surely, 2^131216511 is an apocalyptic number.

131216511 is a deficient number, since it is larger than the sum of its proper divisors (43738841).

131216511 is an equidigital number, since it uses as much as digits as its factorization.

131216511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43738840.

The product of its digits is 180, while the sum is 21.

The square root of 131216511 is about 11454.9775643604. The cubic root of 131216511 is about 508.1549517497.

Adding to 131216511 its reverse (115612131), we get a palindrome (246828642).

The spelling of 131216511 in words is "one hundred thirty-one million, two hundred sixteen thousand, five hundred eleven".