1911225 has 24 divisors (see below), whose sum is σ = 3348000. Its totient is φ = 958720.

The previous prime is 1911211. The next prime is 1911227. The reversal of 1911225 is 5221191.

It is not a de Polignac number, because 1911225 - 2⁴ = 1911209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1911227) 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, 526 + ... + 2024.

It is an arithmetic number, because the mean of its divisors is an integer number (139500).

2^1911225 is an apocalyptic number.

1911225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1911225 is a deficient number, since it is larger than the sum of its proper divisors (1436775).

1911225 is a wasteful number, since it uses less digits than its factorization.

1911225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529 (or 1524 counting only the distinct ones).

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

The square root of 1911225 is about 1382.4706145159. The cubic root of 1911225 is about 124.0996640644.

The spelling of 1911225 in words is "one million, nine hundred eleven thousand, two hundred twenty-five".