1212023243 has 4 divisors (see below), whose sum is σ = 1275813960. Its totient is φ = 1148232528.

The previous prime is 1212023191. The next prime is 1212023251. The reversal of 1212023243 is 3423202121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3423202121 = 907 ⋅3774203.

It is a cyclic number.

It is not a de Polignac number, because 1212023243 - 2¹⁰ = 1212022219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212022243) 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, 31895330 + ... + 31895367.

It is an arithmetic number, because the mean of its divisors is an integer number (318953490).

Almost surely, 2^1212023243 is an apocalyptic number.

1212023243 is a deficient number, since it is larger than the sum of its proper divisors (63790717).

1212023243 is an equidigital number, since it uses as much as digits as its factorization.

1212023243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63790716.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1212023243 is about 34814.1241883233. The cubic root of 1212023243 is about 1066.1958377895.

Adding to 1212023243 its reverse (3423202121), we get a palindrome (4635225364).

The spelling of 1212023243 in words is "one billion, two hundred twelve million, twenty-three thousand, two hundred forty-three".