64489391 has 2 divisors, whose sum is σ = 64489392. Its totient is φ = 64489390.

The previous prime is 64489367. The next prime is 64489427. The reversal of 64489391 is 19398446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64489391 - 2¹⁴ = 64473007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64489361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32244695 + 32244696.

It is an arithmetic number, because the mean of its divisors is an integer number (32244696).

Almost surely, 2^64489391 is an apocalyptic number.

64489391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64489391 is an equidigital number, since it uses as much as digits as its factorization.

64489391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 64489391 is about 8030.5286874527. The cubic root of 64489391 is about 401.0169767876.

The spelling of 64489391 in words is "sixty-four million, four hundred eighty-nine thousand, three hundred ninety-one".