1211115355 has 8 divisors (see below), whose sum is σ = 1466200512. Its totient is φ = 960317568.

The previous prime is 1211115319. The next prime is 1211115419. The reversal of 1211115355 is 5535111121.

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 1211115355 - 2⁹ = 1211114843 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1071219 + ... + 1072348.

It is an arithmetic number, because the mean of its divisors is an integer number (183275064).

Almost surely, 2^1211115355 is an apocalyptic number.

1211115355 is a deficient number, since it is larger than the sum of its proper divisors (255085157).

1211115355 is a wasteful number, since it uses less digits than its factorization.

1211115355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143685.

The product of its digits is 750, while the sum is 25.

The square root of 1211115355 is about 34801.0826699400. The cubic root of 1211115355 is about 1065.9295535113.

Adding to 1211115355 its reverse (5535111121), we get a palindrome (6746226476).

The spelling of 1211115355 in words is "one billion, two hundred eleven million, one hundred fifteen thousand, three hundred fifty-five".