1601655 has 32 divisors (see below), whose sum is σ = 2965248. Its totient is φ = 729600.

The previous prime is 1601653. The next prime is 1601659. The reversal of 1601655 is 5561061.

It is not a de Polignac number, because 1601655 - 2¹ = 1601653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2520 + ... + 3090.

It is an arithmetic number, because the mean of its divisors is an integer number (92664).

2^1601655 is an apocalyptic number.

1601655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1601655 is a deficient number, since it is larger than the sum of its proper divisors (1363593).

1601655 is a wasteful number, since it uses less digits than its factorization.

1601655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1601655 is about 1265.5650911747. The cubic root of 1601655 is about 117.0010227100.

The spelling of 1601655 in words is "one million, six hundred one thousand, six hundred fifty-five".