1561725 has 36 divisors (see below), whose sum is σ = 3056352. Its totient is φ = 756000.

The previous prime is 1561711. The next prime is 1561727. The reversal of 1561725 is 5271651.

It is not a de Polignac number, because 1561725 - 2⁷ = 1561597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561727) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2160 + ... + 2790.

2^1561725 is an apocalyptic number.

1561725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561725 is a deficient number, since it is larger than the sum of its proper divisors (1494627).

1561725 is a wasteful number, since it uses less digits than its factorization.

1561725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 650 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 1561725 is about 1249.6899615505. The cubic root of 1561725 is about 116.0205324336.

It can be divided in two parts, 156 and 1725, that added together give a palindrome (1881).

The spelling of 1561725 in words is "one million, five hundred sixty-one thousand, seven hundred twenty-five".