231040065 has 16 divisors (see below), whose sum is σ = 371044800. Its totient is φ = 122761152.

The previous prime is 231040039. The next prime is 231040067. The reversal of 231040065 is 560040132.

It is a happy number.

It is not a de Polignac number, because 231040065 - 2¹² = 231035969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231040067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24595 + ... + 32664.

It is an arithmetic number, because the mean of its divisors is an integer number (23190300).

Almost surely, 2^231040065 is an apocalyptic number.

It is an amenable number.

231040065 is a deficient number, since it is larger than the sum of its proper divisors (140004735).

231040065 is a wasteful number, since it uses less digits than its factorization.

231040065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57536.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 231040065 is about 15200.0021381577. The cubic root of 231040065 is about 613.6147152956.

Adding to 231040065 its reverse (560040132), we get a palindrome (791080197).

The spelling of 231040065 in words is "two hundred thirty-one million, forty thousand, sixty-five".