1155441211 has 4 divisors (see below), whose sum is σ = 1163196000. Its totient is φ = 1147686424.

The previous prime is 1155441187. The next prime is 1155441247. The reversal of 1155441211 is 1121445511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155441211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155441811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3877171 + ... + 3877468.

It is an arithmetic number, because the mean of its divisors is an integer number (290799000).

Almost surely, 2^1155441211 is an apocalyptic number.

1155441211 is a deficient number, since it is larger than the sum of its proper divisors (7754789).

1155441211 is an equidigital number, since it uses as much as digits as its factorization.

1155441211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7754788.

The product of its digits is 800, while the sum is 25.

The square root of 1155441211 is about 33991.7815214207. The cubic root of 1155441211 is about 1049.3393307223.

Adding to 1155441211 its reverse (1121445511), we get a palindrome (2276886722).

The spelling of 1155441211 in words is "one billion, one hundred fifty-five million, four hundred forty-one thousand, two hundred eleven".