65133521 has 4 divisors (see below), whose sum is σ = 65320500. Its totient is φ = 64946544.

The previous prime is 65133517. The next prime is 65133527. The reversal of 65133521 is 12533156.

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 30747025 + 34386496 = 5545^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 65133521 - 2² = 65133517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65133527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92966 + ... + 93663.

It is an arithmetic number, because the mean of its divisors is an integer number (16330125).

Almost surely, 2^65133521 is an apocalyptic number.

It is an amenable number.

65133521 is a deficient number, since it is larger than the sum of its proper divisors (186979).

65133521 is a wasteful number, since it uses less digits than its factorization.

65133521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186978.

The product of its digits is 2700, while the sum is 26.

The square root of 65133521 is about 8070.5341211100. The cubic root of 65133521 is about 402.3476959350.

Adding to 65133521 its reverse (12533156), we get a palindrome (77666677).

The spelling of 65133521 in words is "sixty-five million, one hundred thirty-three thousand, five hundred twenty-one".