1213452133 has 4 divisors (see below), whose sum is σ = 1255295340. Its totient is φ = 1171608928.

The previous prime is 1213452091. The next prime is 1213452139. The reversal of 1213452133 is 3312543121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3312543121 = 3109 ⋅1065469.

It can be written as a sum of positive squares in 2 ways, for example, as 648058849 + 565393284 = 25457^2 + 23778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213452133 - 2¹³ = 1213443941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213452098 and 1213452107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213452139) 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, 20921560 + ... + 20921617.

It is an arithmetic number, because the mean of its divisors is an integer number (313823835).

Almost surely, 2^1213452133 is an apocalyptic number.

It is an amenable number.

1213452133 is a deficient number, since it is larger than the sum of its proper divisors (41843207).

1213452133 is an equidigital number, since it uses as much as digits as its factorization.

1213452133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41843206.

The product of its digits is 2160, while the sum is 25.

The square root of 1213452133 is about 34834.6398431217. The cubic root of 1213452133 is about 1066.6146631657.

Adding to 1213452133 its reverse (3312543121), we get a palindrome (4525995254).

The spelling of 1213452133 in words is "one billion, two hundred thirteen million, four hundred fifty-two thousand, one hundred thirty-three".