231240355 has 12 divisors (see below), whose sum is σ = 292864032. Its totient is φ = 175254480.

The previous prime is 231240323. The next prime is 231240371. The reversal of 231240355 is 553042132.

231240355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231240355 - 2⁵ = 231240323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62251 + ... + 65860.

It is an arithmetic number, because the mean of its divisors is an integer number (24405336).

Almost surely, 2^231240355 is an apocalyptic number.

231240355 is a deficient number, since it is larger than the sum of its proper divisors (61623677).

231240355 is a wasteful number, since it uses less digits than its factorization.

231240355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128154 (or 128135 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 231240355 is about 15206.5891967923. The cubic root of 231240355 is about 613.7919794914.

Adding to 231240355 its reverse (553042132), we get a palindrome (784282487).

The spelling of 231240355 in words is "two hundred thirty-one million, two hundred forty thousand, three hundred fifty-five".