2116825 has 6 divisors (see below), whose sum is σ = 2624894. Its totient is φ = 1693440.

The previous prime is 2116817. The next prime is 2116837. The reversal of 2116825 is 5286112.

It can be written as a sum of positive squares in 3 ways, for example, as 447561 + 1669264 = 669^2 + 1292^2 .

It is not a de Polignac number, because 2116825 - 2³ = 2116817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 84673 = 2116825 / (2 + 1 + 1 + 6 + 8 + 2 + 5).

It is a Duffinian number.

2116825 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2116825.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42312 + ... + 42361.

2^2116825 is an apocalyptic number.

2116825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2116825 is a deficient number, since it is larger than the sum of its proper divisors (508069).

2116825 is an equidigital number, since it uses as much as digits as its factorization.

2116825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84683 (or 84678 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 2116825 is about 1454.9312698544. The cubic root of 2116825 is about 128.3990031399.

The spelling of 2116825 in words is "two million, one hundred sixteen thousand, eight hundred twenty-five".