65521241 has 2 divisors, whose sum is σ = 65521242. Its totient is φ = 65521240.

The previous prime is 65521219. The next prime is 65521271. The reversal of 65521241 is 14212556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56310016 + 9211225 = 7504^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 65521241 - 2¹⁸ = 65259097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65521241.

It is not a weakly prime, because it can be changed into another prime (65521271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32760620 + 32760621.

It is an arithmetic number, because the mean of its divisors is an integer number (32760621).

Almost surely, 2^65521241 is an apocalyptic number.

It is an amenable number.

65521241 is a deficient number, since it is larger than the sum of its proper divisors (1).

65521241 is an equidigital number, since it uses as much as digits as its factorization.

65521241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 65521241 is about 8094.5191951097. The cubic root of 65521241 is about 403.1444681101.

Adding to 65521241 its reverse (14212556), we get a palindrome (79733797).

The spelling of 65521241 in words is "sixty-five million, five hundred twenty-one thousand, two hundred forty-one".