131515 has 8 divisors (see below), whose sum is σ = 163440. Its totient is φ = 101472.

The previous prime is 131507. The next prime is 131519. The reversal of 131515 is 515131.

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

It is a cyclic number.

It is not a de Polignac number, because 131515 - 2³ = 131507 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (131519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309 + ... + 598.

It is an arithmetic number, because the mean of its divisors is an integer number (20430).

2¹³¹⁵¹⁵ is an apocalyptic number.

131515 is a deficient number, since it is larger than the sum of its proper divisors (31925).

131515 is an equidigital number, since it uses as much as digits as its factorization.

131515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941.

The product of its digits is 75, while the sum is 16.

The square root of 131515 is about 362.6499689784. The cubic root of 131515 is about 50.8539973917.

Adding to 131515 its reverse (515131), we get a palindrome (646646).

It can be divided in two parts, 131 and 515, that added together give a palindrome (646).

The spelling of 131515 in words is "one hundred thirty-one thousand, five hundred fifteen".