65505231 has 24 divisors (see below), whose sum is σ = 103584000. Its totient is φ = 39560400.

The previous prime is 65505149. The next prime is 65505241. The reversal of 65505231 is 13250556.

65505231 is a `hidden beast` number, since 655 + 0 + 5 + 2 + 3 + 1 = 666.

It is not a de Polignac number, because 65505231 - 2¹¹ = 65503183 is a prime.

It is a super-2 number, since 2×65505231² = 8581870576726722, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 65505195 and 65505204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65505241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31770 + ... + 33768.

It is an arithmetic number, because the mean of its divisors is an integer number (4316000).

Almost surely, 2^65505231 is an apocalyptic number.

65505231 is a deficient number, since it is larger than the sum of its proper divisors (38078769).

65505231 is a wasteful number, since it uses less digits than its factorization.

65505231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347 (or 2344 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 65505231 is about 8093.5301939265. The cubic root of 65505231 is about 403.1116295547. Note that the first 3 decimals are identical.

Adding to 65505231 its reverse (13250556), we get a palindrome (78755787).

It can be divided in two parts, 6550 and 5231, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 65505231 in words is "sixty-five million, five hundred five thousand, two hundred thirty-one".