65089921 has 16 divisors (see below), whose sum is σ = 72011520. Its totient is φ = 58464000.

The previous prime is 65089903. The next prime is 65089943. The reversal of 65089921 is 12998056.

It is a 3-Lehmer number, since φ(65089921) divides (65089921-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65089921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65089901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86296 + ... + 87046.

It is an arithmetic number, because the mean of its divisors is an integer number (4500720).

Almost surely, 2^65089921 is an apocalyptic number.

It is an amenable number.

65089921 is a deficient number, since it is larger than the sum of its proper divisors (6921599).

65089921 is a wasteful number, since it uses less digits than its factorization.

65089921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 65089921 is about 8067.8324846268. The cubic root of 65089921 is about 402.2578994934.

The spelling of 65089921 in words is "sixty-five million, eighty-nine thousand, nine hundred twenty-one".