1811265 has 16 divisors (see below), whose sum is σ = 3068928. Its totient is φ = 909056.

The previous prime is 1811219. The next prime is 1811287. The reversal of 1811265 is 5621181.

It is a cyclic number.

It is not a de Polignac number, because 1811265 - 2¹⁰ = 1810241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3297 + ... + 3806.

It is an arithmetic number, because the mean of its divisors is an integer number (191808).

2^1811265 is an apocalyptic number.

1811265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1811265 is a deficient number, since it is larger than the sum of its proper divisors (1257663).

1811265 is a wasteful number, since it uses less digits than its factorization.

1811265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128.

The product of its digits is 480, while the sum is 24.

The square root of 1811265 is about 1345.8324561401. The cubic root of 1811265 is about 121.8972753499.

The spelling of 1811265 in words is "one million, eight hundred eleven thousand, two hundred sixty-five".