1211432231 has 2 divisors, whose sum is σ = 1211432232. Its totient is φ = 1211432230.

The previous prime is 1211432179. The next prime is 1211432237. The reversal of 1211432231 is 1322341121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1322341121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211432231 - 2¹⁴ = 1211415847 is a prime.

It is a super-3 number, since 3×1211432231³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211432237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605716115 + 605716116.

It is an arithmetic number, because the mean of its divisors is an integer number (605716116).

Almost surely, 2^1211432231 is an apocalyptic number.

1211432231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211432231 is an equidigital number, since it uses as much as digits as its factorization.

1211432231 is an evil number, because the sum of its binary digits is even.

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

The square root of 1211432231 is about 34805.6350466415. The cubic root of 1211432231 is about 1066.0225086093.

Adding to 1211432231 its reverse (1322341121), we get a palindrome (2533773352).

The spelling of 1211432231 in words is "one billion, two hundred eleven million, four hundred thirty-two thousand, two hundred thirty-one".