1211234231 has 4 divisors (see below), whose sum is σ = 1221953232. Its totient is φ = 1200515232.

The previous prime is 1211234203. The next prime is 1211234243. The reversal of 1211234231 is 1324321121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211234231 is a prime.

It is a super-2 number, since 2×1211234231² = 2934176724692322722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211234251) 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, 5359331 + ... + 5359556.

It is an arithmetic number, because the mean of its divisors is an integer number (305488308).

Almost surely, 2^1211234231 is an apocalyptic number.

1211234231 is a deficient number, since it is larger than the sum of its proper divisors (10719001).

1211234231 is a wasteful number, since it uses less digits than its factorization.

1211234231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10719000.

The product of its digits is 288, while the sum is 20.

The square root of 1211234231 is about 34802.7905634017. The cubic root of 1211234231 is about 1065.9644275073.

Adding to 1211234231 its reverse (1324321121), we get a palindrome (2535555352).

The spelling of 1211234231 in words is "one billion, two hundred eleven million, two hundred thirty-four thousand, two hundred thirty-one".