1231123101 has 16 divisors (see below), whose sum is σ = 1774073280. Its totient is φ = 754911360.

The previous prime is 1231123081. The next prime is 1231123133. The reversal of 1231123101 is 1013211321.

It is a happy number.

It is not a de Polignac number, because 1231123101 - 2⁷ = 1231122973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231123151) 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, 45211 + ... + 67128.

It is an arithmetic number, because the mean of its divisors is an integer number (110879580).

Almost surely, 2^1231123101 is an apocalyptic number.

It is an amenable number.

1231123101 is a deficient number, since it is larger than the sum of its proper divisors (542950179).

1231123101 is a wasteful number, since it uses less digits than its factorization.

1231123101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112636.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1231123101 is about 35087.3638365723. The cubic root of 1231123101 is about 1071.7672780093.

Adding to 1231123101 its reverse (1013211321), we get a palindrome (2244334422).

The spelling of 1231123101 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, one hundred one".