131223203197 has 2 divisors, whose sum is σ = 131223203198. Its totient is φ = 131223203196.

The previous prime is 131223203161. The next prime is 131223203219. The reversal of 131223203197 is 791302322131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107119398681 + 24103804516 = 327291^2 + 155254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131223203197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131223203117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611601598 + 65611601599.

It is an arithmetic number, because the mean of its divisors is an integer number (65611601599).

Almost surely, 2^131223203197 is an apocalyptic number.

It is an amenable number.

131223203197 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223203197 is an equidigital number, since it uses as much as digits as its factorization.

131223203197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The spelling of 131223203197 in words is "one hundred thirty-one billion, two hundred twenty-three million, two hundred three thousand, one hundred ninety-seven".