231243440511 has 8 divisors (see below), whose sum is σ = 308344314880. Its totient is φ = 154152429912.

The previous prime is 231243440507. The next prime is 231243440539. The reversal of 231243440511 is 115044342132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231243440511 - 2² = 231243440507 is a prime.

It is a super-2 number, since 2×231243440511² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243440501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2411065 + ... + 2505138.

It is an arithmetic number, because the mean of its divisors is an integer number (38543039360).

Almost surely, 2^231243440511 is an apocalyptic number.

231243440511 is a deficient number, since it is larger than the sum of its proper divisors (77100874369).

231243440511 is a wasteful number, since it uses less digits than its factorization.

231243440511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931885.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 231243440511 its reverse (115044342132), we get a palindrome (346287782643).

The spelling of 231243440511 in words is "two hundred thirty-one billion, two hundred forty-three million, four hundred forty thousand, five hundred eleven".