64969391 has 2 divisors, whose sum is σ = 64969392. Its totient is φ = 64969390.

The previous prime is 64969357. The next prime is 64969441. The reversal of 64969391 is 19396946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64969391 - 2⁶ = 64969327 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 (64969351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32484695 + 32484696.

It is an arithmetic number, because the mean of its divisors is an integer number (32484696).

Almost surely, 2^64969391 is an apocalyptic number.

64969391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64969391 is an equidigital number, since it uses as much as digits as its factorization.

64969391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 64969391 is about 8060.3592351706. The cubic root of 64969391 is about 402.0094529266.

The spelling of 64969391 in words is "sixty-four million, nine hundred sixty-nine thousand, three hundred ninety-one".