1211313233 has 4 divisors (see below), whose sum is σ = 1304491188. Its totient is φ = 1118135280.

The previous prime is 1211313197. The next prime is 1211313253. The reversal of 1211313233 is 3323131121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158180929 + 1053132304 = 12577^2 + 32452^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211313233 - 2¹² = 1211309137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211313253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46588958 + ... + 46588983.

It is an arithmetic number, because the mean of its divisors is an integer number (326122797).

Almost surely, 2^1211313233 is an apocalyptic number.

1211313233 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1211313233 is a deficient number, since it is larger than the sum of its proper divisors (93177955).

1211313233 is an equidigital number, since it uses as much as digits as its factorization.

1211313233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93177954.

The product of its digits is 324, while the sum is 20.

The square root of 1211313233 is about 34803.9255400881. The cubic root of 1211313233 is about 1065.9876026258.

Adding to 1211313233 its reverse (3323131121), we get a palindrome (4534444354).

The spelling of 1211313233 in words is "one billion, two hundred eleven million, three hundred thirteen thousand, two hundred thirty-three".