1561025 has 12 divisors (see below), whose sum is σ = 2050092. Its totient is φ = 1175040.

The previous prime is 1561019. The next prime is 1561037. The reversal of 1561025 is 5201651.

It can be written as a sum of positive squares in 6 ways, for example, as 101761 + 1459264 = 319^2 + 1208^2 .

It is not a de Polignac number, because 1561025 - 2¹⁶ = 1495489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1560988 and 1561006.

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, 1412 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (170841).

2^1561025 is an apocalyptic number.

It is an amenable number.

1561025 is a deficient number, since it is larger than the sum of its proper divisors (489067).

1561025 is a wasteful number, since it uses less digits than its factorization.

1561025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1561025 is about 1249.4098606942. The cubic root of 1561025 is about 116.0031955124.

Adding to 1561025 its reverse (5201651), we get a palindrome (6762676).

The spelling of 1561025 in words is "one million, five hundred sixty-one thousand, twenty-five".