1211328455 has 8 divisors (see below), whose sum is σ = 1539099792. Its totient is φ = 912059008.

The previous prime is 1211328439. The next prime is 1211328457. The reversal of 1211328455 is 5548231121.

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 1211328455 - 2⁴ = 1211328439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211328457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7125377 + ... + 7125546.

It is an arithmetic number, because the mean of its divisors is an integer number (192387474).

Almost surely, 2^1211328455 is an apocalyptic number.

1211328455 is a deficient number, since it is larger than the sum of its proper divisors (327771337).

1211328455 is a wasteful number, since it uses less digits than its factorization.

1211328455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14250945.

The product of its digits is 9600, while the sum is 32.

The square root of 1211328455 is about 34804.1442216297. The cubic root of 1211328455 is about 1065.9920678610.

Adding to 1211328455 its reverse (5548231121), we get a palindrome (6759559576).

The spelling of 1211328455 in words is "one billion, two hundred eleven million, three hundred twenty-eight thousand, four hundred fifty-five".