11965831 has 2 divisors, whose sum is σ = 11965832. Its totient is φ = 11965830.

The previous prime is 11965817. The next prime is 11965847. The reversal of 11965831 is 13856911.

It is a weak prime.

It is an emirp because it is prime and its reverse (13856911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11965831 - 2¹⁵ = 11933063 is a prime.

It is a super-2 number, since 2×11965831² = 286362223041122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11965531) 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, 5982915 + 5982916.

It is an arithmetic number, because the mean of its divisors is an integer number (5982916).

Almost surely, 2^11965831 is an apocalyptic number.

11965831 is a deficient number, since it is larger than the sum of its proper divisors (1).

11965831 is an equidigital number, since it uses as much as digits as its factorization.

11965831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 11965831 is about 3459.1662290211. The cubic root of 11965831 is about 228.7253433764.

The spelling of 11965831 in words is "eleven million, nine hundred sixty-five thousand, eight hundred thirty-one".