1561325 has 18 divisors (see below), whose sum is σ = 2055114. Its totient is φ = 1176480.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561325 is 5231651.

It can be written as a sum of positive squares in 3 ways, for example, as 346921 + 1214404 = 589^2 + 1102^2 .

It is not a de Polignac number, because 1561325 - 2⁸ = 1561069 is a prime.

It is a super-3 number, since 3×1561325³ = 11418293335953609375, which contains 333 as substring.

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 1561325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8939 + ... + 9111.

It is an arithmetic number, because the mean of its divisors is an integer number (114173).

2^1561325 is an apocalyptic number.

It is an amenable number.

1561325 is a deficient number, since it is larger than the sum of its proper divisors (493789).

1561325 is a wasteful number, since it uses less digits than its factorization.

1561325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 197 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 1561325 is about 1249.5299116068. The cubic root of 1561325 is about 116.0106262560.

Adding to 1561325 its reverse (5231651), we get a palindrome (6792976).

The spelling of 1561325 in words is "one million, five hundred sixty-one thousand, three hundred twenty-five".