65719391 has 2 divisors, whose sum is σ = 65719392. Its totient is φ = 65719390.

The previous prime is 65719369. The next prime is 65719421. The reversal of 65719391 is 19391756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65719391 - 2⁶ = 65719327 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 (65719321) 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, 32859695 + 32859696.

It is an arithmetic number, because the mean of its divisors is an integer number (32859696).

Almost surely, 2^65719391 is an apocalyptic number.

65719391 is a deficient number, since it is larger than the sum of its proper divisors (1).

65719391 is an equidigital number, since it uses as much as digits as its factorization.

65719391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 41.

The square root of 65719391 is about 8106.7497185987. The cubic root of 65719391 is about 403.5504569794.

The spelling of 65719391 in words is "sixty-five million, seven hundred nineteen thousand, three hundred ninety-one".