1225700100 has 135 divisors (see below), whose sum is σ = 3983475727. Its totient is φ = 326013120.

The previous prime is 1225700083. The next prime is 1225700111. The reversal of 1225700100 is 10075221.

The square root of 1225700100 is 35010.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 203747076 + 1021953024 = 14274^2 + 31968^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3150706 + ... + 3151094.

Almost surely, 2^1225700100 is an apocalyptic number.

1225700100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225700100 is the 35010-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225700100

1225700100 is an abundant number, since it is smaller than the sum of its proper divisors (2757775627).

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

1225700100 is an equidigital number, since it uses as much as digits as its factorization.

1225700100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The cubic root of 1225700100 is about 1070.1912780004.

Adding to 1225700100 its reverse (10075221), we get a palindrome (1235775321).

The spelling of 1225700100 in words is "one billion, two hundred twenty-five million, seven hundred thousand, one hundred".