1091825 has 24 divisors (see below), whose sum is σ = 1642752. Its totient is φ = 702720.

The previous prime is 1091809. The next prime is 1091837. The reversal of 1091825 is 5281901.

It is a happy number.

It is not a de Polignac number, because 1091825 - 2⁴ = 1091809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1091794 and 1091803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2792 + ... + 3158.

It is an arithmetic number, because the mean of its divisors is an integer number (68448).

2^1091825 is an apocalyptic number.

It is an amenable number.

1091825 is a deficient number, since it is larger than the sum of its proper divisors (550927).

1091825 is a wasteful number, since it uses less digits than its factorization.

1091825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1091825 is about 1044.9043018382. The cubic root of 1091825 is about 102.9716514814.

The spelling of 1091825 in words is "one million, ninety-one thousand, eight hundred twenty-five".