131228197 has 2 divisors, whose sum is σ = 131228198. Its totient is φ = 131228196.

The previous prime is 131228171. The next prime is 131228281. The reversal of 131228197 is 791822131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115971361 + 15256836 = 10769^2 + 3906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131228197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131228297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65614098 + 65614099.

It is an arithmetic number, because the mean of its divisors is an integer number (65614099).

Almost surely, 2^131228197 is an apocalyptic number.

It is an amenable number.

131228197 is a deficient number, since it is larger than the sum of its proper divisors (1).

131228197 is an equidigital number, since it uses as much as digits as its factorization.

131228197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 131228197 is about 11455.4876369363. The cubic root of 131228197 is about 508.1700365446.

The spelling of 131228197 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, one hundred ninety-seven".