1561225 has 12 divisors (see below), whose sum is σ = 1951884. Its totient is φ = 1238720.

The previous prime is 1561213. The next prime is 1561243. The reversal of 1561225 is 5221651.

It can be written as a sum of positive squares in 6 ways, for example, as 13689 + 1547536 = 117^2 + 1244^2 .

It is not a de Polignac number, because 1561225 - 2⁵ = 1561193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561196 and 1561205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4767 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (162657).

2^1561225 is an apocalyptic number.

It is an amenable number.

1561225 is a deficient number, since it is larger than the sum of its proper divisors (390659).

1561225 is a wasteful number, since it uses less digits than its factorization.

1561225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 519 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 1561225 is about 1249.4898959175. The cubic root of 1561225 is about 116.0081494473.

Adding to 1561225 its reverse (5221651), we get a palindrome (6782876).

The spelling of 1561225 in words is "one million, five hundred sixty-one thousand, two hundred twenty-five".