231445155 has 16 divisors (see below), whose sum is σ = 378192384. Its totient is φ = 120810720.

The previous prime is 231445153. The next prime is 231445169. The reversal of 231445155 is 551544132.

It is not a de Polignac number, because 231445155 - 2¹ = 231445153 is a prime.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (231445153) 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, 163441 + ... + 164850.

It is an arithmetic number, because the mean of its divisors is an integer number (23637024).

Almost surely, 2^231445155 is an apocalyptic number.

231445155 is a deficient number, since it is larger than the sum of its proper divisors (146747229).

231445155 is a wasteful number, since it uses less digits than its factorization.

231445155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328346.

The product of its digits is 12000, while the sum is 30.

The square root of 231445155 is about 15213.3216294141. The cubic root of 231445155 is about 613.9731293966.

Adding to 231445155 its reverse (551544132), we get a palindrome (782989287).

The spelling of 231445155 in words is "two hundred thirty-one million, four hundred forty-five thousand, one hundred fifty-five".