231240545 has 32 divisors (see below), whose sum is σ = 311921280. Its totient is φ = 163537920.

The previous prime is 231240523. The next prime is 231240553. The reversal of 231240545 is 545042132.

It is a happy number.

231240545 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 231240545 - 2⁶ = 231240481 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211019 + ... + 212111.

It is an arithmetic number, because the mean of its divisors is an integer number (9747540).

Almost surely, 2^231240545 is an apocalyptic number.

It is an amenable number.

231240545 is a deficient number, since it is larger than the sum of its proper divisors (80680735).

231240545 is a wasteful number, since it uses less digits than its factorization.

231240545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 231240545 is about 15206.5954440828. The cubic root of 231240545 is about 613.7921475999.

Adding to 231240545 its reverse (545042132), we get a palindrome (776282677).

The spelling of 231240545 in words is "two hundred thirty-one million, two hundred forty thousand, five hundred forty-five".