1225001225 has 36 divisors (see below), whose sum is σ = 1784677068. Its totient is φ = 831600000.

The previous prime is 1225001213. The next prime is 1225001237. The reversal of 1225001225 is 5221005221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1225001213) and next prime (1225001237).

It can be written as a sum of positive squares in 6 ways, for example, as 225240064 + 999761161 = 15008^2 + 31619^2 .

It is not a de Polignac number, because 1225001225 - 2¹⁰ = 1225000201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225001197 and 1225001206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 118775 + ... + 128675.

It is an arithmetic number, because the mean of its divisors is an integer number (49574363).

Almost surely, 2^1225001225 is an apocalyptic number.

It is an amenable number.

1225001225 is a deficient number, since it is larger than the sum of its proper divisors (559675843).

1225001225 is a wasteful number, since it uses less digits than its factorization.

1225001225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10026 (or 10014 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1225001225 is about 35000.0174999956. The cubic root of 1225001225 is about 1069.9878372275.

Adding to 1225001225 its reverse (5221005221), we get a palindrome (6446006446).

It can be divided in two parts, 122500 and 1225, that multiplied together give a square (150062500 = 12250²).

The spelling of 1225001225 in words is "one billion, two hundred twenty-five million, one thousand, two hundred twenty-five".