231405155 has 16 divisors (see below), whose sum is σ = 285604704. Its totient is φ = 179911680.

The previous prime is 231405137. The next prime is 231405157. The reversal of 231405155 is 551504132.

It is not a de Polignac number, because 231405155 - 2⁶ = 231405091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231405157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24275 + ... + 32435.

It is an arithmetic number, because the mean of its divisors is an integer number (17850294).

Almost surely, 2^231405155 is an apocalyptic number.

231405155 is a deficient number, since it is larger than the sum of its proper divisors (54199549).

231405155 is a wasteful number, since it uses less digits than its factorization.

231405155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8326.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 231405155 is about 15212.0069353126. The cubic root of 231405155 is about 613.9377569558.

Adding to 231405155 its reverse (551504132), we get a palindrome (782909287).

The spelling of 231405155 in words is "two hundred thirty-one million, four hundred five thousand, one hundred fifty-five".