131537261 has 2 divisors, whose sum is σ = 131537262. Its totient is φ = 131537260.

The previous prime is 131537233. The next prime is 131537267. The reversal of 131537261 is 162735131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94692361 + 36844900 = 9731^2 + 6070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131537261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131537267) 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, 65768630 + 65768631.

It is an arithmetic number, because the mean of its divisors is an integer number (65768631).

Almost surely, 2^131537261 is an apocalyptic number.

It is an amenable number.

131537261 is a deficient number, since it is larger than the sum of its proper divisors (1).

131537261 is an equidigital number, since it uses as much as digits as its factorization.

131537261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 131537261 is about 11468.9694829134. The cubic root of 131537261 is about 508.5686651179.

The spelling of 131537261 in words is "one hundred thirty-one million, five hundred thirty-seven thousand, two hundred sixty-one".