2191825 has 12 divisors (see below), whose sum is σ = 2757388. Its totient is φ = 1728000.

The previous prime is 2191823. The next prime is 2191873. The reversal of 2191825 is 5281912.

It can be written as a sum of positive squares in 6 ways, for example, as 467856 + 1723969 = 684^2 + 1313^2 .

It is not a de Polignac number, because 2191825 - 2¹ = 2191823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2191793 and 2191802.

It is not an unprimeable number, because it can be changed into a prime (2191823) 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, 1225 + ... + 2425.

2^2191825 is an apocalyptic number.

2191825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2191825 is a deficient number, since it is larger than the sum of its proper divisors (565563).

2191825 is a wasteful number, since it uses less digits than its factorization.

2191825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1279 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 2191825 is about 1480.4813406457. The cubic root of 2191825 is about 129.8978487468.

The spelling of 2191825 in words is "two million, one hundred ninety-one thousand, eight hundred twenty-five".