65311243 has 4 divisors (see below), whose sum is σ = 65452768. Its totient is φ = 65169720.

The previous prime is 65311231. The next prime is 65311249. The reversal of 65311243 is 34211356.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65311243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65311249) 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, 70068 + ... + 70993.

It is an arithmetic number, because the mean of its divisors is an integer number (16363192).

Almost surely, 2^65311243 is an apocalyptic number.

65311243 is a deficient number, since it is larger than the sum of its proper divisors (141525).

65311243 is a wasteful number, since it uses less digits than its factorization.

65311243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141524.

The product of its digits is 2160, while the sum is 25.

The square root of 65311243 is about 8081.5371681382. The cubic root of 65311243 is about 402.7133095131.

Adding to 65311243 its reverse (34211356), we get a palindrome (99522599).

The spelling of 65311243 in words is "sixty-five million, three hundred eleven thousand, two hundred forty-three".