231440240405 has 16 divisors (see below), whose sum is σ = 313423776000. Its totient is φ = 162516029760.

The previous prime is 231440240393. The next prime is 231440240441. The reversal of 231440240405 is 504042044132.

It is not a de Polignac number, because 231440240405 - 2⁴ = 231440240389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72550205 + ... + 72553394.

It is an arithmetic number, because the mean of its divisors is an integer number (19588986000).

Almost surely, 2^231440240405 is an apocalyptic number.

It is an amenable number.

231440240405 is a deficient number, since it is larger than the sum of its proper divisors (81983535595).

231440240405 is a wasteful number, since it uses less digits than its factorization.

231440240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145103644.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 231440240405 its reverse (504042044132), we get a palindrome (735482284537).

The spelling of 231440240405 in words is "two hundred thirty-one billion, four hundred forty million, two hundred forty thousand, four hundred five".