131166817 has 2 divisors, whose sum is σ = 131166818. Its totient is φ = 131166816.

The previous prime is 131166811. The next prime is 131166829. The reversal of 131166817 is 718661131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119443041 + 11723776 = 10929^2 + 3424^2 .

It is an emirp because it is prime and its reverse (718661131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131166817 - 2¹⁹ = 130642529 is a prime.

It is a super-2 number, since 2×131166817² = 34409467763822978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131166811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65583408 + 65583409.

It is an arithmetic number, because the mean of its divisors is an integer number (65583409).

Almost surely, 2^131166817 is an apocalyptic number.

It is an amenable number.

131166817 is a deficient number, since it is larger than the sum of its proper divisors (1).

131166817 is an equidigital number, since it uses as much as digits as its factorization.

131166817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 131166817 is about 11452.8082582395. The cubic root of 131166817 is about 508.0907945780.

The spelling of 131166817 in words is "one hundred thirty-one million, one hundred sixty-six thousand, eight hundred seventeen".