1220204525 has 6 divisors (see below), whose sum is σ = 1513053642. Its totient is φ = 976163600.

The previous prime is 1220204473. The next prime is 1220204527. The reversal of 1220204525 is 5254020221.

It can be written as a sum of positive squares in 3 ways, for example, as 416935561 + 803268964 = 20419^2 + 28342^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1220204525 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220204525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220204527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24404066 + ... + 24404115.

It is an arithmetic number, because the mean of its divisors is an integer number (252175607).

Almost surely, 2^1220204525 is an apocalyptic number.

It is an amenable number.

1220204525 is a deficient number, since it is larger than the sum of its proper divisors (292849117).

1220204525 is an equidigital number, since it uses as much as digits as its factorization.

1220204525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48808191 (or 48808186 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1220204525 is about 34931.4260373092. The cubic root of 1220204525 is about 1068.5894374800.

Adding to 1220204525 its reverse (5254020221), we get a palindrome (6474224746).

The spelling of 1220204525 in words is "one billion, two hundred twenty million, two hundred four thousand, five hundred twenty-five".