131313521 has 2 divisors, whose sum is σ = 131313522. Its totient is φ = 131313520.

The previous prime is 131313493. The next prime is 131313587. The reversal of 131313521 is 125313131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97219600 + 34093921 = 9860^2 + 5839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131313521 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131313493 and 131313502.

It is not a weakly prime, because it can be changed into another prime (131313121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65656760 + 65656761.

It is an arithmetic number, because the mean of its divisors is an integer number (65656761).

Almost surely, 2^131313521 is an apocalyptic number.

It is an amenable number.

131313521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131313521 is an equidigital number, since it uses as much as digits as its factorization.

131313521 is an evil number, because the sum of its binary digits is even.

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

The square root of 131313521 is about 11459.2111857667. The cubic root of 131313521 is about 508.2801493285.

Adding to 131313521 its reverse (125313131), we get a palindrome (256626652).

The spelling of 131313521 in words is "one hundred thirty-one million, three hundred thirteen thousand, five hundred twenty-one".