1601851 has 4 divisors (see below), whose sum is σ = 1614592. Its totient is φ = 1589112.

The previous prime is 1601849. The next prime is 1601857. The reversal of 1601851 is 1581061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1601851 - 2¹ = 1601849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601857) 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 3 ways as a sum of consecutive naturals, for example, 6180 + ... + 6433.

It is an arithmetic number, because the mean of its divisors is an integer number (403648).

2^1601851 is an apocalyptic number.

1601851 is a deficient number, since it is larger than the sum of its proper divisors (12741).

1601851 is a wasteful number, since it uses less digits than its factorization.

1601851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12740.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1601851 is about 1265.6425245700. The cubic root of 1601851 is about 117.0057951205.

The spelling of 1601851 in words is "one million, six hundred one thousand, eight hundred fifty-one".