131710321 has 4 divisors (see below), whose sum is σ = 131789812. Its totient is φ = 131630832.

The previous prime is 131710307. The next prime is 131710331. The reversal of 131710321 is 123017131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78127921 + 53582400 = 8839^2 + 7320^2 .

It is a cyclic number.

It is not a de Polignac number, because 131710321 - 2⁷ = 131710193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131710331) 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, 37206 + ... + 40591.

It is an arithmetic number, because the mean of its divisors is an integer number (32947453).

Almost surely, 2^131710321 is an apocalyptic number.

It is an amenable number.

131710321 is a deficient number, since it is larger than the sum of its proper divisors (79491).

131710321 is an equidigital number, since it uses as much as digits as its factorization.

131710321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79490.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 131710321 is about 11476.5117087031. The cubic root of 131710321 is about 508.7916040327.

Adding to 131710321 its reverse (123017131), we get a palindrome (254727452).

The spelling of 131710321 in words is "one hundred thirty-one million, seven hundred ten thousand, three hundred twenty-one".