1605121 has 8 divisors (see below), whose sum is σ = 1897920. Its totient is φ = 1328208.

The previous prime is 1605103. The next prime is 1605127. The reversal of 1605121 is 1215061.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1605121 - 2⁹ = 1604609 is a prime.

It is a Duffinian number.

1605121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1605095 and 1605104.

It is not an unprimeable number, because it can be changed into a prime (1605127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3751 + ... + 4156.

It is an arithmetic number, because the mean of its divisors is an integer number (237240).

2^1605121 is an apocalyptic number.

It is an amenable number.

1605121 is a deficient number, since it is larger than the sum of its proper divisors (292799).

1605121 is an equidigital number, since it uses as much as digits as its factorization.

1605121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7943.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1605121 is about 1266.9336999228. The cubic root of 1605121 is about 117.0853590944.

Subtracting from 1605121 its product of nonzero digits (60), we obtain a palindrome (1605061).

The spelling of 1605121 in words is "one million, six hundred five thousand, one hundred twenty-one".