1155140211 has 4 divisors (see below), whose sum is σ = 1540186952. Its totient is φ = 770093472.

The previous prime is 1155140177. The next prime is 1155140227. The reversal of 1155140211 is 1120415511.

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

It is not a de Polignac number, because 1155140211 - 2⁷ = 1155140083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155140281) 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, 192523366 + ... + 192523371.

It is an arithmetic number, because the mean of its divisors is an integer number (385046738).

Almost surely, 2^1155140211 is an apocalyptic number.

1155140211 is a deficient number, since it is larger than the sum of its proper divisors (385046741).

1155140211 is an equidigital number, since it uses as much as digits as its factorization.

1155140211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385046740.

The product of its (nonzero) digits is 200, while the sum is 21.

The square root of 1155140211 is about 33987.3536922191. The cubic root of 1155140211 is about 1049.2482028869.

Adding to 1155140211 its reverse (1120415511), we get a palindrome (2275555722).

The spelling of 1155140211 in words is "one billion, one hundred fifty-five million, one hundred forty thousand, two hundred eleven".