131037521 has 2 divisors, whose sum is σ = 131037522. Its totient is φ = 131037520.

The previous prime is 131037497. The next prime is 131037539. The reversal of 131037521 is 125730131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95277121 + 35760400 = 9761^2 + 5980^2 .

It is an emirp because it is prime and its reverse (125730131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131037521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131027521) 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 as a sum of consecutive naturals, namely, 65518760 + 65518761.

It is an arithmetic number, because the mean of its divisors is an integer number (65518761).

Almost surely, 2^131037521 is an apocalyptic number.

It is an amenable number.

131037521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131037521 is an equidigital number, since it uses as much as digits as its factorization.

131037521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 131037521 is about 11447.1621374033. The cubic root of 131037521 is about 507.9237917074.

Adding to 131037521 its reverse (125730131), we get a palindrome (256767652).

The spelling of 131037521 in words is "one hundred thirty-one million, thirty-seven thousand, five hundred twenty-one".