11965817 has 2 divisors, whose sum is σ = 11965818. Its totient is φ = 11965816.

The previous prime is 11965781. The next prime is 11965831. The reversal of 11965817 is 71856911.

Together with previous prime (11965781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11363641 + 602176 = 3371^2 + 776^2 .

It is a cyclic number.

It is not a de Polignac number, because 11965817 - 2⁶ = 11965753 is a prime.

It is not a weakly prime, because it can be changed into another prime (11965847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5982908 + 5982909.

It is an arithmetic number, because the mean of its divisors is an integer number (5982909).

Almost surely, 2^11965817 is an apocalyptic number.

It is an amenable number.

11965817 is a deficient number, since it is larger than the sum of its proper divisors (1).

11965817 is an equidigital number, since it uses as much as digits as its factorization.

11965817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 11965817 is about 3459.1642054115. The cubic root of 11965817 is about 228.7252541736.

The spelling of 11965817 in words is "eleven million, nine hundred sixty-five thousand, eight hundred seventeen".