64573139 has 2 divisors, whose sum is σ = 64573140. Its totient is φ = 64573138.

The previous prime is 64573129. The next prime is 64573141. The reversal of 64573139 is 93137546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64573139 is a prime.

Together with 64573141, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3816929 and since 64573139 and 3816929 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64573129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32286569 + 32286570.

It is an arithmetic number, because the mean of its divisors is an integer number (32286570).

Almost surely, 2^64573139 is an apocalyptic number.

64573139 is a deficient number, since it is larger than the sum of its proper divisors (1).

64573139 is an equidigital number, since it uses as much as digits as its factorization.

64573139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 64573139 is about 8035.7413472560. The cubic root of 64573139 is about 401.1904928849.

The spelling of 64573139 in words is "sixty-four million, five hundred seventy-three thousand, one hundred thirty-nine".