1231211033 has 4 divisors (see below), whose sum is σ = 1325919588. Its totient is φ = 1136502480.

The previous prime is 1231211029. The next prime is 1231211053. The reversal of 1231211033 is 3301121321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3301121321 = 1699 ⋅1942979.

It can be written as a sum of positive squares in 2 ways, for example, as 522213904 + 708997129 = 22852^2 + 26627^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231211033 - 2² = 1231211029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231211053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47354258 + ... + 47354283.

It is an arithmetic number, because the mean of its divisors is an integer number (331479897).

Almost surely, 2^1231211033 is an apocalyptic number.

1231211033 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1231211033 is a deficient number, since it is larger than the sum of its proper divisors (94708555).

1231211033 is an equidigital number, since it uses as much as digits as its factorization.

1231211033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94708554.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231211033 is about 35088.6168578928. The cubic root of 1231211033 is about 1071.7927941137.

Adding to 1231211033 its reverse (3301121321), we get a palindrome (4532332354).

The spelling of 1231211033 in words is "one billion, two hundred thirty-one million, two hundred eleven thousand, thirty-three".