64139429 has 2 divisors, whose sum is σ = 64139430. Its totient is φ = 64139428.

The previous prime is 64139423. The next prime is 64139437. The reversal of 64139429 is 92493146.

64139429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60808804 + 3330625 = 7798^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 64139429 - 2²⁴ = 47362213 is a prime.

It is a super-2 number, since 2×64139429² = 8227732704892082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64139392 and 64139401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64139423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069714 + 32069715.

It is an arithmetic number, because the mean of its divisors is an integer number (32069715).

Almost surely, 2^64139429 is an apocalyptic number.

It is an amenable number.

64139429 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139429 is an equidigital number, since it uses as much as digits as its factorization.

64139429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 64139429 is about 8008.7095714603. The cubic root of 64139429 is about 400.2902663959.

The spelling of 64139429 in words is "sixty-four million, one hundred thirty-nine thousand, four hundred twenty-nine".