1225324100 has 144 divisors (see below), whose sum is σ = 3570354816. Its totient is φ = 352512000.

The previous prime is 1225324039. The next prime is 1225324151. The reversal of 1225324100 is 14235221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93980 + ... + 106220.

Almost surely, 2^1225324100 is an apocalyptic number.

1225324100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225324100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1785177408).

1225324100 is an abundant number, since it is smaller than the sum of its proper divisors (2345030716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225324100 is a wasteful number, since it uses less digits than its factorization.

1225324100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12286 (or 12279 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1225324100 is about 35004.6296937991. The cubic root of 1225324100 is about 1070.0818349498.

Adding to 1225324100 its reverse (14235221), we get a palindrome (1239559321).

The spelling of 1225324100 in words is "one billion, two hundred twenty-five million, three hundred twenty-four thousand, one hundred".