65131823 has 4 divisors (see below), whose sum is σ = 65644800. Its totient is φ = 64618848.

The previous prime is 65131813. The next prime is 65131853. The reversal of 65131823 is 32813156.

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 65131823 - 2²⁰ = 64083247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65131813) 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, 256298 + ... + 256551.

It is an arithmetic number, because the mean of its divisors is an integer number (16411200).

Almost surely, 2^65131823 is an apocalyptic number.

65131823 is a deficient number, since it is larger than the sum of its proper divisors (512977).

65131823 is a wasteful number, since it uses less digits than its factorization.

65131823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512976.

The product of its digits is 4320, while the sum is 29.

The square root of 65131823 is about 8070.4289229260. The cubic root of 65131823 is about 402.3441995668.

Adding to 65131823 its reverse (32813156), we get a palindrome (97944979).

The spelling of 65131823 in words is "sixty-five million, one hundred thirty-one thousand, eight hundred twenty-three".