131215313 has 4 divisors (see below), whose sum is σ = 133063488. Its totient is φ = 129367140.

The previous prime is 131215309. The next prime is 131215321. The reversal of 131215313 is 313512131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131215313 - 2² = 131215309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131215303) 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, 923981 + ... + 924122.

It is an arithmetic number, because the mean of its divisors is an integer number (33265872).

Almost surely, 2^131215313 is an apocalyptic number.

It is an amenable number.

131215313 is a deficient number, since it is larger than the sum of its proper divisors (1848175).

131215313 is an equidigital number, since it uses as much as digits as its factorization.

131215313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848174.

The product of its digits is 270, while the sum is 20.

The square root of 131215313 is about 11454.9252725629. The cubic root of 131215313 is about 508.1534052688.

Adding to 131215313 its reverse (313512131), we get a palindrome (444727444).

The spelling of 131215313 in words is "one hundred thirty-one million, two hundred fifteen thousand, three hundred thirteen".