1211111243 has 8 divisors (see below), whose sum is σ = 1284894720. Its totient is φ = 1138331880.

The previous prime is 1211111201. The next prime is 1211111249. The reversal of 1211111243 is 3421111121.

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 1211111243 - 2⁸ = 1211110987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211111249) 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, 248543 + ... + 253368.

It is an arithmetic number, because the mean of its divisors is an integer number (160611840).

Almost surely, 2^1211111243 is an apocalyptic number.

1211111243 is a deficient number, since it is larger than the sum of its proper divisors (73783477).

1211111243 is a wasteful number, since it uses less digits than its factorization.

1211111243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502057.

The product of its digits is 48, while the sum is 17.

The square root of 1211111243 is about 34801.0235912681. The cubic root of 1211111243 is about 1065.9283471557.

Adding to 1211111243 its reverse (3421111121), we get a palindrome (4632222364).

The spelling of 1211111243 in words is "one billion, two hundred eleven million, one hundred eleven thousand, two hundred forty-three".