2011651 has 4 divisors (see below), whose sum is σ = 2018392. Its totient is φ = 2004912.

The previous prime is 2011637. The next prime is 2011657. The reversal of 2011651 is 1561102.

It is a happy number.

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 2011651 - 2¹¹ = 2009603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2901 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (504598).

2^2011651 is an apocalyptic number.

2011651 is a deficient number, since it is larger than the sum of its proper divisors (6741).

2011651 is an equidigital number, since it uses as much as digits as its factorization.

2011651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6740.

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

The square root of 2011651 is about 1418.3268311641. The cubic root of 2011651 is about 126.2362871098.

Adding to 2011651 its reverse (1561102), we get a palindrome (3572753).

It can be divided in two parts, 2011 and 651, that added together give a palindrome (2662).

The spelling of 2011651 in words is "two million, eleven thousand, six hundred fifty-one".