1211403243 has 8 divisors (see below), whose sum is σ = 1627534656. Its totient is φ = 801437000.

The previous prime is 1211403241. The next prime is 1211403253. The reversal of 1211403243 is 3423041121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211403243 - 2¹ = 1211403241 is a prime.

It is a super-3 number, since 3×1211403243³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211403241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540833 + ... + 1541618.

It is an arithmetic number, because the mean of its divisors is an integer number (203441832).

Almost surely, 2^1211403243 is an apocalyptic number.

1211403243 is a deficient number, since it is larger than the sum of its proper divisors (416131413).

1211403243 is a wasteful number, since it uses less digits than its factorization.

1211403243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082585.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1211403243 is about 34805.2186173281. The cubic root of 1211403243 is about 1066.0140056968.

Adding to 1211403243 its reverse (3423041121), we get a palindrome (4634444364).

The spelling of 1211403243 in words is "one billion, two hundred eleven million, four hundred three thousand, two hundred forty-three".