131818201 has 2 divisors, whose sum is σ = 131818202. Its totient is φ = 131818200.

The previous prime is 131818189. The next prime is 131818207. The reversal of 131818201 is 102818131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124657225 + 7160976 = 11165^2 + 2676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131818201 is a prime.

It is a super-2 number, since 2×131818201² = 34752076229752802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131818207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65909100 + 65909101.

It is an arithmetic number, because the mean of its divisors is an integer number (65909101).

Almost surely, 2^131818201 is an apocalyptic number.

It is an amenable number.

131818201 is a deficient number, since it is larger than the sum of its proper divisors (1).

131818201 is an equidigital number, since it uses as much as digits as its factorization.

131818201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 131818201 is about 11481.2107810980. The cubic root of 131818201 is about 508.9304781386.

The spelling of 131818201 in words is "one hundred thirty-one million, eight hundred eighteen thousand, two hundred one".