65429921 has 4 divisors (see below), whose sum is σ = 66077844. Its totient is φ = 64782000.

The previous prime is 65429909. The next prime is 65429951. The reversal of 65429921 is 12992456.

65429921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48455521 + 16974400 = 6961^2 + 4120^2 .

It is a cyclic number.

It is not a de Polignac number, because 65429921 - 2⁶ = 65429857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65429951) 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 in 3 ways as a sum of consecutive naturals, for example, 323810 + ... + 324011.

It is an arithmetic number, because the mean of its divisors is an integer number (16519461).

Almost surely, 2^65429921 is an apocalyptic number.

It is an amenable number.

65429921 is a deficient number, since it is larger than the sum of its proper divisors (647923).

65429921 is a wasteful number, since it uses less digits than its factorization.

65429921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647922.

The product of its digits is 38880, while the sum is 38.

The square root of 65429921 is about 8088.8763743798. The cubic root of 65429921 is about 402.9570872996.

The spelling of 65429921 in words is "sixty-five million, four hundred twenty-nine thousand, nine hundred twenty-one".