1191225 has 24 divisors (see below), whose sum is σ = 2251840. Its totient is φ = 544320.

The previous prime is 1191221. The next prime is 1191247. The reversal of 1191225 is 5221911.

1191225 = T₅₁₀ + T₅₁₁ + ... + T₅₁₈.

It is not a de Polignac number, because 1191225 - 2² = 1191221 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1191221) 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, 610 + ... + 1659.

2^1191225 is an apocalyptic number.

1191225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191225 is a deficient number, since it is larger than the sum of its proper divisors (1060615).

1191225 is a wasteful number, since it uses less digits than its factorization.

1191225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289 (or 2284 counting only the distinct ones).

The product of its digits is 180, while the sum is 21.

The square root of 1191225 is about 1091.4325448694. The cubic root of 1191225 is about 106.0061999459.

The spelling of 1191225 in words is "one million, one hundred ninety-one thousand, two hundred twenty-five".