1213131233 has 4 divisors (see below), whose sum is σ = 1217448708. Its totient is φ = 1208813760.

The previous prime is 1213131223. The next prime is 1213131281. The reversal of 1213131233 is 3321313121.

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 503867809 + 709263424 = 22447^2 + 26632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213131233 - 2⁸ = 1213130977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213131223) 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, 2158316 + ... + 2158877.

It is an arithmetic number, because the mean of its divisors is an integer number (304362177).

Almost surely, 2^1213131233 is an apocalyptic number.

It is an amenable number.

1213131233 is a deficient number, since it is larger than the sum of its proper divisors (4317475).

1213131233 is an equidigital number, since it uses as much as digits as its factorization.

1213131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317474.

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

The square root of 1213131233 is about 34830.0334912271. The cubic root of 1213131233 is about 1066.5206320368.

Adding to 1213131233 its reverse (3321313121), we get a palindrome (4534444354).

The spelling of 1213131233 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-three".