1625565 has 16 divisors (see below), whose sum is σ = 2616768. Its totient is φ = 861696.

The previous prime is 1625551. The next prime is 1625573. The reversal of 1625565 is 5655261.

It is not a de Polignac number, because 1625565 - 2⁶ = 1625501 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

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 15 ways as a sum of consecutive naturals, for example, 4429 + ... + 4781.

It is an arithmetic number, because the mean of its divisors is an integer number (163548).

2^1625565 is an apocalyptic number.

1625565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1625565 is a deficient number, since it is larger than the sum of its proper divisors (991203).

1625565 is a wasteful number, since it uses less digits than its factorization.

1625565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 9000, while the sum is 30.

The square root of 1625565 is about 1274.9764703711. The cubic root of 1625565 is about 117.5803584902.

The spelling of 1625565 in words is "one million, six hundred twenty-five thousand, five hundred sixty-five".