1561825 has 6 divisors (see below), whose sum is σ = 1936694. Its totient is φ = 1249440.

The previous prime is 1561823. The next prime is 1561829. The reversal of 1561825 is 5281651.

It can be written as a sum of positive squares in 3 ways, for example, as 104976 + 1456849 = 324^2 + 1207^2 .

It is not a de Polignac number, because 1561825 - 2¹ = 1561823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561793 and 1561802.

It is not an unprimeable number, because it can be changed into a prime (1561823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31212 + ... + 31261.

2^1561825 is an apocalyptic number.

It is an amenable number.

1561825 is a deficient number, since it is larger than the sum of its proper divisors (374869).

1561825 is an equidigital number, since it uses as much as digits as its factorization.

1561825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62483 (or 62478 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 1561825 is about 1249.7299708337. The cubic root of 1561825 is about 116.0230087137.

The spelling of 1561825 in words is "one million, five hundred sixty-one thousand, eight hundred twenty-five".