2001651 has 8 divisors (see below), whose sum is σ = 2719440. Its totient is φ = 1309152.

The previous prime is 2001641. The next prime is 2001653. The reversal of 2001651 is 1561002.

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

It is not a de Polignac number, because 2001651 - 2⁵ = 2001619 is a prime.

2001651 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6136 + ... + 6453.

It is an arithmetic number, because the mean of its divisors is an integer number (339930).

2^2001651 is an apocalyptic number.

2001651 is a deficient number, since it is larger than the sum of its proper divisors (717789).

2001651 is a wasteful number, since it uses less digits than its factorization.

2001651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12645.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2001651 is about 1414.7971586061. The cubic root of 2001651 is about 126.0267642817.

Adding to 2001651 its reverse (1561002), we get a palindrome (3562653).

The spelling of 2001651 in words is "two million, one thousand, six hundred fifty-one".