1131225 has 12 divisors (see below), whose sum is σ = 1870416. Its totient is φ = 603280.

The previous prime is 1131223. The next prime is 1131239. The reversal of 1131225 is 5221311.

It is not a de Polignac number, because 1131225 - 2¹ = 1131223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1131223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7467 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (155868).

2^1131225 is an apocalyptic number.

1131225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131225 is a deficient number, since it is larger than the sum of its proper divisors (739191).

1131225 is a wasteful number, since it uses less digits than its factorization.

1131225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15096 (or 15091 counting only the distinct ones).

The product of its digits is 60, while the sum is 15.

The square root of 1131225 is about 1063.5906167318. The cubic root of 1131225 is about 104.1956683691.

Adding to 1131225 its reverse (5221311), we get a palindrome (6352536).

The spelling of 1131225 in words is "one million, one hundred thirty-one thousand, two hundred twenty-five".