131203217 has 2 divisors, whose sum is σ = 131203218. Its totient is φ = 131203216.

The previous prime is 131203213. The next prime is 131203301. The reversal of 131203217 is 712302131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125462401 + 5740816 = 11201^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 131203217 - 2² = 131203213 is a prime.

It is a super-2 number, since 2×131203217² = 34428568302298178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131203213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65601608 + 65601609.

It is an arithmetic number, because the mean of its divisors is an integer number (65601609).

Almost surely, 2^131203217 is an apocalyptic number.

It is an amenable number.

131203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

131203217 is an equidigital number, since it uses as much as digits as its factorization.

131203217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 131203217 is about 11454.3972779016. The cubic root of 131203217 is about 508.1377901897.

Adding to 131203217 its reverse (712302131), we get a palindrome (843505348).

The spelling of 131203217 in words is "one hundred thirty-one million, two hundred three thousand, two hundred seventeen".