1161155 has 12 divisors (see below), whose sum is σ = 1459920. Its totient is φ = 886512.

The previous prime is 1161143. The next prime is 1161163. The reversal of 1161155 is 5511611.

It is not a de Polignac number, because 1161155 - 2⁶ = 1161091 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2426 + ... + 2864.

It is an arithmetic number, because the mean of its divisors is an integer number (121660).

2^1161155 is an apocalyptic number.

1161155 is a deficient number, since it is larger than the sum of its proper divisors (298765).

1161155 is an equidigital number, since it uses as much as digits as its factorization.

1161155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 467 counting only the distinct ones).

The product of its digits is 150, while the sum is 20.

The square root of 1161155 is about 1077.5690233113. The cubic root of 1161155 is about 105.1066188360.

Adding to 1161155 its reverse (5511611), we get a palindrome (6672766).

The spelling of 1161155 in words is "one million, one hundred sixty-one thousand, one hundred fifty-five".