1155012211 has 4 divisors (see below), whose sum is σ = 1165233672. Its totient is φ = 1144790752.

The previous prime is 1155012151. The next prime is 1155012281. The reversal of 1155012211 is 1122105511.

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

It is a cyclic number.

It is not a de Polignac number, because 1155012211 - 2⁷ = 1155012083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155012281) 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, 5110561 + ... + 5110786.

It is an arithmetic number, because the mean of its divisors is an integer number (291308418).

Almost surely, 2^1155012211 is an apocalyptic number.

1155012211 is a deficient number, since it is larger than the sum of its proper divisors (10221461).

1155012211 is a wasteful number, since it uses less digits than its factorization.

1155012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221460.

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 1155012211 is about 33985.4705867081. The cubic root of 1155012211 is about 1049.2094460532.

Adding to 1155012211 its reverse (1122105511), we get a palindrome (2277117722).

The spelling of 1155012211 in words is "one billion, one hundred fifty-five million, twelve thousand, two hundred eleven".