217136131 has 2 divisors, whose sum is σ = 217136132. Its totient is φ = 217136130.

The previous prime is 217136119. The next prime is 217136173. The reversal of 217136131 is 131631712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217136131 - 2²⁷ = 82918403 is a prime.

It is a super-2 number, since 2×217136131² = 94296198771298322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217136096 and 217136105.

It is not a weakly prime, because it can be changed into another prime (217136191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108568065 + 108568066.

It is an arithmetic number, because the mean of its divisors is an integer number (108568066).

Almost surely, 2^217136131 is an apocalyptic number.

217136131 is a deficient number, since it is larger than the sum of its proper divisors (1).

217136131 is an equidigital number, since it uses as much as digits as its factorization.

217136131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 217136131 is about 14735.5397254393. The cubic root of 217136131 is about 601.0501341065.

Adding to 217136131 its reverse (131631712), we get a palindrome (348767843).

The spelling of 217136131 in words is "two hundred seventeen million, one hundred thirty-six thousand, one hundred thirty-one".