131225309 has 2 divisors, whose sum is σ = 131225310. Its totient is φ = 131225308.

The previous prime is 131225299. The next prime is 131225317. The reversal of 131225309 is 903522131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 60295225 = 8422^2 + 7765^2 .

It is a cyclic number.

It is not a de Polignac number, because 131225309 - 2⁸ = 131225053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131225359) 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, 65612654 + 65612655.

It is an arithmetic number, because the mean of its divisors is an integer number (65612655).

Almost surely, 2^131225309 is an apocalyptic number.

It is an amenable number.

131225309 is a deficient number, since it is larger than the sum of its proper divisors (1).

131225309 is an equidigital number, since it uses as much as digits as its factorization.

131225309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 131225309 is about 11455.3615831191. The cubic root of 131225309 is about 508.1663086724.

The spelling of 131225309 in words is "one hundred thirty-one million, two hundred twenty-five thousand, three hundred nine".