1161138 has 32 divisors (see below), whose sum is σ = 2578752. Its totient is φ = 345600.

The previous prime is 1161137. The next prime is 1161143. The reversal of 1161138 is 8311611.

It is not an unprimeable number, because it can be changed into a prime (1161137) 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, 4698 + ... + 4938.

It is an arithmetic number, because the mean of its divisors is an integer number (80586).

2^1161138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289376).

1161138 is an abundant number, since it is smaller than the sum of its proper divisors (1417614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161138 is a wasteful number, since it uses less digits than its factorization.

1161138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330.

The product of its digits is 144, while the sum is 21.

The square root of 1161138 is about 1077.5611351566. The cubic root of 1161138 is about 105.1061058924.

Adding to 1161138 its reverse (8311611), we get a palindrome (9472749).

The spelling of 1161138 in words is "one million, one hundred sixty-one thousand, one hundred thirty-eight".