64989719 has 2 divisors, whose sum is σ = 64989720. Its totient is φ = 64989718.

The previous prime is 64989707. The next prime is 64989721. The reversal of 64989719 is 91798946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64989719 - 2¹² = 64985623 is a prime.

It is a super-2 number, since 2×64989719² = 8447327151397922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 64989721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64949719) 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, 32494859 + 32494860.

It is an arithmetic number, because the mean of its divisors is an integer number (32494860).

Almost surely, 2^64989719 is an apocalyptic number.

64989719 is a deficient number, since it is larger than the sum of its proper divisors (1).

64989719 is an equidigital number, since it uses as much as digits as its factorization.

64989719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 64989719 is about 8061.6201225312. The cubic root of 64989719 is about 402.0513762378.

The spelling of 64989719 in words is "sixty-four million, nine hundred eighty-nine thousand, seven hundred nineteen".