65116991 has 2 divisors, whose sum is σ = 65116992. Its totient is φ = 65116990.

The previous prime is 65116981. The next prime is 65117029. The reversal of 65116991 is 19961156.

It is a happy number.

It is an a-pointer prime, because the next prime (65117029) can be obtained adding 65116991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65116991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65116901) 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, 32558495 + 32558496.

It is an arithmetic number, because the mean of its divisors is an integer number (32558496).

Almost surely, 2^65116991 is an apocalyptic number.

65116991 is a deficient number, since it is larger than the sum of its proper divisors (1).

65116991 is an equidigital number, since it uses as much as digits as its factorization.

65116991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 65116991 is about 8069.5099603384. The cubic root of 65116991 is about 402.3136562679.

The spelling of 65116991 in words is "sixty-five million, one hundred sixteen thousand, nine hundred ninety-one".