1211433431 has 16 divisors (see below), whose sum is σ = 1314115488. Its totient is φ = 1110144000.

The previous prime is 1211433383. The next prime is 1211433449. The reversal of 1211433431 is 1343341121.

It is a cyclic number.

It is not a de Polignac number, because 1211433431 - 2¹⁰ = 1211432407 is a prime.

It is a super-3 number, since 3×1211433431³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211433397 and 1211433406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211433731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1464440 + ... + 1465266.

It is an arithmetic number, because the mean of its divisors is an integer number (82132218).

Almost surely, 2^1211433431 is an apocalyptic number.

1211433431 is a deficient number, since it is larger than the sum of its proper divisors (102682057).

1211433431 is a wasteful number, since it uses less digits than its factorization.

1211433431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522.

The product of its digits is 864, while the sum is 23.

The square root of 1211433431 is about 34805.6522852252. The cubic root of 1211433431 is about 1066.0228605967.

Adding to 1211433431 its reverse (1343341121), we get a palindrome (2554774552).

The spelling of 1211433431 in words is "one billion, two hundred eleven million, four hundred thirty-three thousand, four hundred thirty-one".