65491771 has 2 divisors, whose sum is σ = 65491772. Its totient is φ = 65491770.

The previous prime is 65491759. The next prime is 65491817. The reversal of 65491771 is 17719456.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65491771 is a prime.

It is not a weakly prime, because it can be changed into another prime (65492771) 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, 32745885 + 32745886.

It is an arithmetic number, because the mean of its divisors is an integer number (32745886).

Almost surely, 2^65491771 is an apocalyptic number.

65491771 is a deficient number, since it is larger than the sum of its proper divisors (1).

65491771 is an equidigital number, since it uses as much as digits as its factorization.

65491771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 65491771 is about 8092.6986228328. The cubic root of 65491771 is about 403.0840172347.

The spelling of 65491771 in words is "sixty-five million, four hundred ninety-one thousand, seven hundred seventy-one".