1155312111 has 16 divisors (see below), whose sum is σ = 1548626688. Its totient is φ = 766113600.

The previous prime is 1155312107. The next prime is 1155312131. The reversal of 1155312111 is 1112135511.

It is not a de Polignac number, because 1155312111 - 2² = 1155312107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155312131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763846 + ... + 765356.

It is an arithmetic number, because the mean of its divisors is an integer number (96789168).

Almost surely, 2^1155312111 is an apocalyptic number.

1155312111 is a deficient number, since it is larger than the sum of its proper divisors (393314577).

1155312111 is a wasteful number, since it uses less digits than its factorization.

1155312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702.

The product of its digits is 150, while the sum is 21.

The square root of 1155312111 is about 33989.8824799381. The cubic root of 1155312111 is about 1049.3002475992.

Adding to 1155312111 its reverse (1112135511), we get a palindrome (2267447622).

The spelling of 1155312111 in words is "one billion, one hundred fifty-five million, three hundred twelve thousand, one hundred eleven".