1825821225 has 36 divisors (see below), whose sum is σ = 3350027772. Its totient is φ = 950016000.

The previous prime is 1825821223. The next prime is 1825821241. The reversal of 1825821225 is 5221285281.

1825821225 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 678237849 + 1147583376 = 26043^2 + 33876^2 .

It is not a de Polignac number, because 1825821225 - 2¹ = 1825821223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1825821225.

It is not an unprimeable number, because it can be changed into a prime (1825821223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 89736 + ... + 108185.

It is an arithmetic number, because the mean of its divisors is an integer number (93056327).

Almost surely, 2^1825821225 is an apocalyptic number.

1825821225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1825821225 is a deficient number, since it is larger than the sum of its proper divisors (1524206547).

1825821225 is a wasteful number, since it uses less digits than its factorization.

1825821225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197978 (or 197970 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 1825821225 is about 42729.6293571568. The cubic root of 1825821225 is about 1222.2294682843.

The spelling of 1825821225 in words is "one billion, eight hundred twenty-five million, eight hundred twenty-one thousand, two hundred twenty-five".