131521317 has 16 divisors (see below), whose sum is σ = 179988480. Its totient is φ = 85376000.

The previous prime is 131521283. The next prime is 131521331. The reversal of 131521317 is 713125131.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131521317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131521387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113692 + ... + 114842.

It is an arithmetic number, because the mean of its divisors is an integer number (11249280).

Almost surely, 2^131521317 is an apocalyptic number.

It is an amenable number.

131521317 is a deficient number, since it is larger than the sum of its proper divisors (48467163).

131521317 is a wasteful number, since it uses less digits than its factorization.

131521317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 630, while the sum is 24.

The square root of 131521317 is about 11468.2743688839. The cubic root of 131521317 is about 508.5481159433.

Adding to 131521317 its reverse (713125131), we get a palindrome (844646448).

The spelling of 131521317 in words is "one hundred thirty-one million, five hundred twenty-one thousand, three hundred seventeen".