65213231 has 4 divisors (see below), whose sum is σ = 66318600. Its totient is φ = 64107864.

The previous prime is 65213227. The next prime is 65213251. The reversal of 65213231 is 13231256.

65213231 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65213231 - 2² = 65213227 is a prime.

It is a super-2 number, since 2×65213231² = 8505530994918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65213197 and 65213206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65213201) 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, 552596 + ... + 552713.

It is an arithmetic number, because the mean of its divisors is an integer number (16579650).

Almost surely, 2^65213231 is an apocalyptic number.

65213231 is a deficient number, since it is larger than the sum of its proper divisors (1105369).

65213231 is a wasteful number, since it uses less digits than its factorization.

65213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105368.

The product of its digits is 1080, while the sum is 23.

The square root of 65213231 is about 8075.4709460192. The cubic root of 65213231 is about 402.5117592336.

Adding to 65213231 its reverse (13231256), we get a palindrome (78444487).

The spelling of 65213231 in words is "sixty-five million, two hundred thirteen thousand, two hundred thirty-one".