1661925 has 12 divisors (see below), whose sum is σ = 2747840. Its totient is φ = 886320.

The previous prime is 1661917. The next prime is 1661939. The reversal of 1661925 is 5291661.

It is not a de Polignac number, because 1661925 - 2³ = 1661917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661892 and 1661901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11005 + ... + 11154.

2^1661925 is an apocalyptic number.

1661925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661925 is a deficient number, since it is larger than the sum of its proper divisors (1085915).

1661925 is a wasteful number, since it uses less digits than its factorization.

1661925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22172 (or 22167 counting only the distinct ones).

The product of its digits is 3240, while the sum is 30.

The square root of 1661925 is about 1289.1567011035. The cubic root of 1661925 is about 118.4505660033.

The spelling of 1661925 in words is "one million, six hundred sixty-one thousand, nine hundred twenty-five".