1211432555 has 8 divisors (see below), whose sum is σ = 1456861632. Its totient is φ = 967051008.

The previous prime is 1211432513. The next prime is 1211432557. The reversal of 1211432555 is 5552341121.

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 1211432555 - 2¹⁰ = 1211431531 is a prime.

It is a super-3 number, since 3×1211432555³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211432557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259334 + ... + 263963.

It is an arithmetic number, because the mean of its divisors is an integer number (182107704).

Almost surely, 2^1211432555 is an apocalyptic number.

1211432555 is a deficient number, since it is larger than the sum of its proper divisors (245429077).

1211432555 is an equidigital number, since it uses as much as digits as its factorization.

1211432555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523765.

The product of its digits is 6000, while the sum is 29.

The square root of 1211432555 is about 34805.6397010599. The cubic root of 1211432555 is about 1066.0226036459.

Adding to 1211432555 its reverse (5552341121), we get a palindrome (6763773676).

The spelling of 1211432555 in words is "one billion, two hundred eleven million, four hundred thirty-two thousand, five hundred fifty-five".