131109217 has 2 divisors, whose sum is σ = 131109218. Its totient is φ = 131109216.

The previous prime is 131109197. The next prime is 131109221. The reversal of 131109217 is 712901131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112021056 + 19088161 = 10584^2 + 4369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131109217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131109191 and 131109200.

It is not a weakly prime, because it can be changed into another prime (131109247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65554608 + 65554609.

It is an arithmetic number, because the mean of its divisors is an integer number (65554609).

Almost surely, 2^131109217 is an apocalyptic number.

It is an amenable number.

131109217 is a deficient number, since it is larger than the sum of its proper divisors (1).

131109217 is an equidigital number, since it uses as much as digits as its factorization.

131109217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 131109217 is about 11450.2933150204. The cubic root of 131109217 is about 508.0164101277.

The spelling of 131109217 in words is "one hundred thirty-one million, one hundred nine thousand, two hundred seventeen".