1206520225 has 9 divisors (see below), whose sum is σ = 1496300467. Its totient is φ = 965077240.

The previous prime is 1206520219. The next prime is 1206520333. The reversal of 1206520225 is 5220256021.

It is a happy number.

The square root of 1206520225 is 34735.

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

It can be written as a sum of positive squares in only one way, i.e., 434347281 + 772172944 = 20841^2 + 27788^2 .

It is not a de Polignac number, because 1206520225 - 2²⁹ = 669649313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1206520225.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 170202 + ... + 177148.

Almost surely, 2^1206520225 is an apocalyptic number.

1206520225 is the 34735-th square number.

1206520225 is the 17368-th centered octagonal number.

It is an amenable number.

1206520225 is a deficient number, since it is larger than the sum of its proper divisors (289780242).

1206520225 is an frugal number, since it uses more digits than its factorization.

1206520225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904 (or 6952 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The cubic root of 1206520225 is about 1064.5797529335.

Multiplying 1206520225 by its sum of digits (25), we get a square (30163005625 = 173675²).

1206520225 divided by its sum of digits (25) gives a square (48260809 = 6947²).

Adding to 1206520225 its reverse (5220256021), we get a palindrome (6426776246).

The spelling of 1206520225 in words is "one billion, two hundred six million, five hundred twenty thousand, two hundred twenty-five".