64653121 has 4 divisors (see below), whose sum is σ = 69626452. Its totient is φ = 59679792.

The previous prime is 64653103. The next prime is 64653133. The reversal of 64653121 is 12135646.

64653121 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, and also an emirpimes, since its reverse is a distinct semiprime: 12135646 = 2 ⋅6067823.

It can be written as a sum of positive squares in 2 ways, for example, as 36180225 + 28472896 = 6015^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 64653121 - 2⁷ = 64652993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64653121.

It is not an unprimeable number, because it can be changed into a prime (64653221) 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, 2486646 + ... + 2486671.

It is an arithmetic number, because the mean of its divisors is an integer number (17406613).

Almost surely, 2^64653121 is an apocalyptic number.

It is an amenable number.

64653121 is a deficient number, since it is larger than the sum of its proper divisors (4973331).

64653121 is a wasteful number, since it uses less digits than its factorization.

64653121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973330.

The product of its digits is 4320, while the sum is 28.

The square root of 64653121 is about 8040.7164481780. The cubic root of 64653121 is about 401.3560662655.

Adding to 64653121 its reverse (12135646), we get a palindrome (76788767).

The spelling of 64653121 in words is "sixty-four million, six hundred fifty-three thousand, one hundred twenty-one".