1181145 has 24 divisors (see below), whose sum is σ = 2199744. Its totient is φ = 539616.

The previous prime is 1181137. The next prime is 1181149. The reversal of 1181145 is 5411811.

It is a happy number.

It is not a de Polignac number, because 1181145 - 2³ = 1181137 is a prime.

It is a super-2 number, since 2×1181145² = 2790207022050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1181149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69 + ... + 1538.

It is an arithmetic number, because the mean of its divisors is an integer number (91656).

2^1181145 is an apocalyptic number.

1181145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1181145 is a deficient number, since it is larger than the sum of its proper divisors (1018599).

1181145 is a wasteful number, since it uses less digits than its factorization.

1181145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1622 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

The square root of 1181145 is about 1086.8049503016. The cubic root of 1181145 is about 105.7063487554.

Adding to 1181145 its reverse (5411811), we get a palindrome (6592956).

It can be divided in two parts, 1181 and 145, that added together give a triangular number (1326 = T₅₁).

The spelling of 1181145 in words is "one million, one hundred eighty-one thousand, one hundred forty-five".