65109391 has 4 divisors (see below), whose sum is σ = 66213000. Its totient is φ = 64005784.

The previous prime is 65109383. The next prime is 65109397. The reversal of 65109391 is 19390156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65109391 - 2³ = 65109383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65109397) 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 in 3 ways as a sum of consecutive naturals, for example, 551716 + ... + 551833.

It is an arithmetic number, because the mean of its divisors is an integer number (16553250).

Almost surely, 2^65109391 is an apocalyptic number.

65109391 is a deficient number, since it is larger than the sum of its proper divisors (1103609).

65109391 is a wasteful number, since it uses less digits than its factorization.

65109391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103608.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 65109391 is about 8069.0390382003. The cubic root of 65109391 is about 402.2980039131.

The spelling of 65109391 in words is "sixty-five million, one hundred nine thousand, three hundred ninety-one".