131613215 has 4 divisors (see below), whose sum is σ = 157935864. Its totient is φ = 105290568.

The previous prime is 131613203. The next prime is 131613217. The reversal of 131613215 is 512316131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512316131 = 17 ⋅30136243.

It is a cyclic number.

It is not a de Polignac number, because 131613215 - 2¹⁸ = 131351071 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131613217) 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, 13161317 + ... + 13161326.

It is an arithmetic number, because the mean of its divisors is an integer number (39483966).

Almost surely, 2^131613215 is an apocalyptic number.

131613215 is a deficient number, since it is larger than the sum of its proper divisors (26322649).

131613215 is an equidigital number, since it uses as much as digits as its factorization.

131613215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26322648.

The product of its digits is 540, while the sum is 23.

The square root of 131613215 is about 11472.2802877196. The cubic root of 131613215 is about 508.6665344503. Note that the first 3 decimals are identical.

Adding to 131613215 its reverse (512316131), we get a palindrome (643929346).

The spelling of 131613215 in words is "one hundred thirty-one million, six hundred thirteen thousand, two hundred fifteen".