1011155 has 4 divisors (see below), whose sum is σ = 1213392. Its totient is φ = 808920.

The previous prime is 1011139. The next prime is 1011163. The reversal of 1011155 is 5511101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5511101 = 239 ⋅23059.

It is not a de Polignac number, because 1011155 - 2⁴ = 1011139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101111 + ... + 101120.

It is an arithmetic number, because the mean of its divisors is an integer number (303348).

2^1011155 is an apocalyptic number.

1011155 is a deficient number, since it is larger than the sum of its proper divisors (202237).

1011155 is an equidigital number, since it uses as much as digits as its factorization.

1011155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202236.

The product of its (nonzero) digits is 25, while the sum is 14.

The square root of 1011155 is about 1005.5620319006. The cubic root of 1011155 is about 100.3704592381.

Adding to 1011155 its reverse (5511101), we get a palindrome (6522256).

The spelling of 1011155 in words is "one million, eleven thousand, one hundred fifty-five".