131197217 has 2 divisors, whose sum is σ = 131197218. Its totient is φ = 131197216.

The previous prime is 131197201. The next prime is 131197219. The reversal of 131197217 is 712791131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127260961 + 3936256 = 11281^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 131197217 - 2⁴ = 131197201 is a prime.

Together with 131197219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131197219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65598608 + 65598609.

It is an arithmetic number, because the mean of its divisors is an integer number (65598609).

Almost surely, 2^131197217 is an apocalyptic number.

It is an amenable number.

131197217 is a deficient number, since it is larger than the sum of its proper divisors (1).

131197217 is an equidigital number, since it uses as much as digits as its factorization.

131197217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 32.

The square root of 131197217 is about 11454.1353667573. The cubic root of 131197217 is about 508.1300442586.

The spelling of 131197217 in words is "one hundred thirty-one million, one hundred ninety-seven thousand, two hundred seventeen".