231231155 has 8 divisors (see below), whose sum is σ = 277774272. Its totient is φ = 184787008.

The previous prime is 231231151. The next prime is 231231179. The reversal of 231231155 is 551132132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231231155 - 2² = 231231151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231231155.

It is not an unprimeable number, because it can be changed into a prime (231231151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19499 + ... + 29028.

It is an arithmetic number, because the mean of its divisors is an integer number (34721784).

Almost surely, 2^231231155 is an apocalyptic number.

231231155 is a deficient number, since it is larger than the sum of its proper divisors (46543117).

231231155 is an equidigital number, since it uses as much as digits as its factorization.

231231155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49485.

The product of its digits is 900, while the sum is 23.

The square root of 231231155 is about 15206.2866933384. The cubic root of 231231155 is about 613.7838393881.

Adding to 231231155 its reverse (551132132), we get a palindrome (782363287).

The spelling of 231231155 in words is "two hundred thirty-one million, two hundred thirty-one thousand, one hundred fifty-five".