1231123235 has 4 divisors (see below), whose sum is σ = 1477347888. Its totient is φ = 984898584.

The previous prime is 1231123219. The next prime is 1231123247. The reversal of 1231123235 is 5323211321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5323211321 = 367 ⋅14504663.

It is a cyclic number.

It is not a de Polignac number, because 1231123235 - 2⁴ = 1231123219 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 1231123235.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123112319 + ... + 123112328.

It is an arithmetic number, because the mean of its divisors is an integer number (369336972).

Almost surely, 2^1231123235 is an apocalyptic number.

1231123235 is a deficient number, since it is larger than the sum of its proper divisors (246224653).

1231123235 is an equidigital number, since it uses as much as digits as its factorization.

1231123235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246224652.

The product of its digits is 1080, while the sum is 23.

The square root of 1231123235 is about 35087.3657460916. The cubic root of 1231123235 is about 1071.7673168944.

Adding to 1231123235 its reverse (5323211321), we get a palindrome (6554334556).

The spelling of 1231123235 in words is "one billion, two hundred thirty-one million, one hundred twenty-three thousand, two hundred thirty-five".