231242155 has 16 divisors (see below), whose sum is σ = 283963968. Its totient is φ = 180720000.

The previous prime is 231242149. The next prime is 231242159. The reversal of 231242155 is 551242132.

It is not a de Polignac number, because 231242155 - 2⁹ = 231241643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231242159) 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, 43545 + ... + 48565.

It is an arithmetic number, because the mean of its divisors is an integer number (17747748).

Almost surely, 2^231242155 is an apocalyptic number.

231242155 is a deficient number, since it is larger than the sum of its proper divisors (52721813).

231242155 is a wasteful number, since it uses less digits than its factorization.

231242155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238.

The product of its digits is 2400, while the sum is 25.

The square root of 231242155 is about 15206.6483815468. The cubic root of 231242155 is about 613.7935720950.

Adding to 231242155 its reverse (551242132), we get a palindrome (782484287).

The spelling of 231242155 in words is "two hundred thirty-one million, two hundred forty-two thousand, one hundred fifty-five".