1155111101 has 4 divisors (see below), whose sum is σ = 1164206592. Its totient is φ = 1146015612.

The previous prime is 1155111091. The next prime is 1155111131. The reversal of 1155111101 is 1011115511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155111101 - 2¹⁸ = 1154848957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155111131) 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, 4547555 + ... + 4547808.

It is an arithmetic number, because the mean of its divisors is an integer number (291051648).

Almost surely, 2^1155111101 is an apocalyptic number.

It is an amenable number.

1155111101 is a deficient number, since it is larger than the sum of its proper divisors (9095491).

1155111101 is an equidigital number, since it uses as much as digits as its factorization.

1155111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9095490.

The product of its (nonzero) digits is 25, while the sum is 17.

The square root of 1155111101 is about 33986.9254419990. The cubic root of 1155111101 is about 1049.2393889866.

Adding to 1155111101 its reverse (1011115511), we get a palindrome (2166226612).

The spelling of 1155111101 in words is "one billion, one hundred fifty-five million, one hundred eleven thousand, one hundred one".