65078191 has 2 divisors, whose sum is σ = 65078192. Its totient is φ = 65078190.

The previous prime is 65078177. The next prime is 65078197. The reversal of 65078191 is 19187056.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65078191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65078191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65078197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32539095 + 32539096.

It is an arithmetic number, because the mean of its divisors is an integer number (32539096).

Almost surely, 2^65078191 is an apocalyptic number.

65078191 is a deficient number, since it is larger than the sum of its proper divisors (1).

65078191 is an equidigital number, since it uses as much as digits as its factorization.

65078191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 65078191 is about 8067.1054908189. The cubic root of 65078191 is about 402.2337341103.

The spelling of 65078191 in words is "sixty-five million, seventy-eight thousand, one hundred ninety-one".