131325781 has 2 divisors, whose sum is σ = 131325782. Its totient is φ = 131325780.

The previous prime is 131325763. The next prime is 131325793. The reversal of 131325781 is 187523131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117375556 + 13950225 = 10834^2 + 3735^2 .

It is a cyclic number.

It is not a de Polignac number, because 131325781 - 2⁵ = 131325749 is a prime.

It is a super-2 number, since 2×131325781² = 34492921510519922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131325751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65662890 + 65662891.

It is an arithmetic number, because the mean of its divisors is an integer number (65662891).

Almost surely, 2^131325781 is an apocalyptic number.

It is an amenable number.

131325781 is a deficient number, since it is larger than the sum of its proper divisors (1).

131325781 is an equidigital number, since it uses as much as digits as its factorization.

131325781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 131325781 is about 11459.7461141161. The cubic root of 131325781 is about 508.2959672495.

The spelling of 131325781 in words is "one hundred thirty-one million, three hundred twenty-five thousand, seven hundred eighty-one".