131543515 has 4 divisors (see below), whose sum is σ = 157852224. Its totient is φ = 105234808.

The previous prime is 131543483. The next prime is 131543527. The reversal of 131543515 is 515345131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515345131 = 7 ⋅73620733.

It is a cyclic number.

It is not a de Polignac number, because 131543515 - 2⁵ = 131543483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13154347 + ... + 13154356.

It is an arithmetic number, because the mean of its divisors is an integer number (39463056).

Almost surely, 2^131543515 is an apocalyptic number.

131543515 is a deficient number, since it is larger than the sum of its proper divisors (26308709).

131543515 is an equidigital number, since it uses as much as digits as its factorization.

131543515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26308708.

The product of its digits is 4500, while the sum is 28.

The square root of 131543515 is about 11469.2421284059. The cubic root of 131543515 is about 508.5767250344.

Adding to 131543515 its reverse (515345131), we get a palindrome (646888646).

The spelling of 131543515 in words is "one hundred thirty-one million, five hundred forty-three thousand, five hundred fifteen".