201231123 has 16 divisors (see below), whose sum is σ = 280239360. Its totient is φ = 128311776.

The previous prime is 201231103. The next prime is 201231127. The reversal of 201231123 is 321132102.

It is a de Polignac number, because none of the positive numbers 2^k-201231123 is a prime.

It is a super-2 number, since 2×201231123² = 80987929727682258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201231127) 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, 8815 + ... + 21912.

It is an arithmetic number, because the mean of its divisors is an integer number (17514960).

Almost surely, 2^201231123 is an apocalyptic number.

201231123 is a deficient number, since it is larger than the sum of its proper divisors (79008237).

201231123 is a wasteful number, since it uses less digits than its factorization.

201231123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30826.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 201231123 is about 14185.5956166810. The cubic root of 201231123 is about 586.0010357315.

Adding to 201231123 its reverse (321132102), we get a palindrome (522363225).

The spelling of 201231123 in words is "two hundred one million, two hundred thirty-one thousand, one hundred twenty-three".