1211340231 has 32 divisors (see below), whose sum is σ = 1895712000. Its totient is φ = 762351264.

The previous prime is 1211340227. The next prime is 1211340233. The reversal of 1211340231 is 1320431121.

It is not a de Polignac number, because 1211340231 - 2² = 1211340227 is a prime.

It is a super-2 number, since 2×1211340231² = 2934690310478266722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211340233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146280 + ... + 154338.

It is an arithmetic number, because the mean of its divisors is an integer number (59241000).

Almost surely, 2^1211340231 is an apocalyptic number.

1211340231 is a deficient number, since it is larger than the sum of its proper divisors (684371769).

1211340231 is a wasteful number, since it uses less digits than its factorization.

1211340231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380 (or 8374 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211340231 is about 34804.3133964743. The cubic root of 1211340231 is about 1065.9955222178.

Adding to 1211340231 its reverse (1320431121), we get a palindrome (2531771352).

The spelling of 1211340231 in words is "one billion, two hundred eleven million, three hundred forty thousand, two hundred thirty-one".