64138619 has 2 divisors, whose sum is σ = 64138620. Its totient is φ = 64138618.

The previous prime is 64138601. The next prime is 64138621. The reversal of 64138619 is 91683146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64138619 - 2¹⁶ = 64073083 is a prime.

It is a super-2 number, since 2×64138619² = 8227524894454322, which contains 22 as substring.

Together with 64138621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64138219) 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, 32069309 + 32069310.

It is an arithmetic number, because the mean of its divisors is an integer number (32069310).

Almost surely, 2^64138619 is an apocalyptic number.

64138619 is a deficient number, since it is larger than the sum of its proper divisors (1).

64138619 is an equidigital number, since it uses as much as digits as its factorization.

64138619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 64138619 is about 8008.6590013560. The cubic root of 64138619 is about 400.2885813353.

The spelling of 64138619 in words is "sixty-four million, one hundred thirty-eight thousand, six hundred nineteen".