1601565 has 24 divisors (see below), whose sum is σ = 2982240. Its totient is φ = 731808.

The previous prime is 1601563. The next prime is 1601569. The reversal of 1601565 is 5651061.

It is not a de Polignac number, because 1601565 - 2¹ = 1601563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355 + ... + 1824.

It is an arithmetic number, because the mean of its divisors is an integer number (124260).

2^1601565 is an apocalyptic number.

1601565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1601565 is a deficient number, since it is larger than the sum of its proper divisors (1380675).

1601565 is a wasteful number, since it uses less digits than its factorization.

1601565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201 (or 2194 counting only the distinct ones).

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

The square root of 1601565 is about 1265.5295334365. The cubic root of 1601565 is about 116.9988311666.

The spelling of 1601565 in words is "one million, six hundred one thousand, five hundred sixty-five".