131216515 has 8 divisors (see below), whose sum is σ = 157802688. Its totient is φ = 104744640.

The previous prime is 131216471. The next prime is 131216537. The reversal of 131216515 is 515612131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131216515 - 2¹¹ = 131214467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131216515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26026 + ... + 30655.

It is an arithmetic number, because the mean of its divisors is an integer number (19725336).

Almost surely, 2^131216515 is an apocalyptic number.

131216515 is a deficient number, since it is larger than the sum of its proper divisors (26586173).

131216515 is an equidigital number, since it uses as much as digits as its factorization.

131216515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57149.

The product of its digits is 900, while the sum is 25.

The square root of 131216515 is about 11454.9777389570. The cubic root of 131216515 is about 508.1549569132.

Adding to 131216515 its reverse (515612131), we get a palindrome (646828646).

The spelling of 131216515 in words is "one hundred thirty-one million, two hundred sixteen thousand, five hundred fifteen".