1231001123 has 12 divisors (see below), whose sum is σ = 1354180464. Its totient is φ = 1118185200.

The previous prime is 1231001071. The next prime is 1231001131. The reversal of 1231001123 is 3211001321.

It is a de Polignac number, because none of the positive numbers 2^k-1231001123 is a prime.

It is a super-2 number, since 2×1231001123² = 3030727529654522258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231001098 and 1231001107.

It is not an unprimeable number, because it can be changed into a prime (1231001153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179465 + ... + 186197.

It is an arithmetic number, because the mean of its divisors is an integer number (112848372).

Almost surely, 2^1231001123 is an apocalyptic number.

1231001123 is a deficient number, since it is larger than the sum of its proper divisors (123179341).

1231001123 is a wasteful number, since it uses less digits than its factorization.

1231001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8266 (or 8255 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231001123 is about 35085.6255894063. The cubic root of 1231001123 is about 1071.7318804262.

Adding to 1231001123 its reverse (3211001321), we get a palindrome (4442002444).

The spelling of 1231001123 in words is "one billion, two hundred thirty-one million, one thousand, one hundred twenty-three".