1225513300 has 144 divisors (see below), whose sum is σ = 3079802880. Its totient is φ = 418608000.

The previous prime is 1225513279. The next prime is 1225513309. The reversal of 1225513300 is 33155221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225513309) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3991747 + ... + 3992053.

It is an arithmetic number, because the mean of its divisors is an integer number (21387520).

Almost surely, 2^1225513300 is an apocalyptic number.

1225513300 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 1225513300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1539901440).

1225513300 is an abundant number, since it is smaller than the sum of its proper divisors (1854289580).

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

1225513300 is a wasteful number, since it uses less digits than its factorization.

1225513300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1225513300 is about 35007.3320891496. The cubic root of 1225513300 is about 1070.1369085595.

Adding to 1225513300 its reverse (33155221), we get a palindrome (1258668521).

The spelling of 1225513300 in words is "one billion, two hundred twenty-five million, five hundred thirteen thousand, three hundred".