11651 has 4 divisors (see below), whose sum is σ = 11904. Its totient is φ = 11400.

The previous prime is 11633. The next prime is 11657. The reversal of 11651 is 15611.

11651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15611 = 67 ⋅233.

It is a cyclic number.

It is not a de Polignac number, because 11651 - 2⁶ = 11587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 15.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (11657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 156.

It is an arithmetic number, because the mean of its divisors is an integer number (2976).

2¹¹⁶⁵¹ is an apocalyptic number.

11651 is a deficient number, since it is larger than the sum of its proper divisors (253).

11651 is an equidigital number, since it uses as much as digits as its factorization.

11651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252.

The product of its digits is 30, while the sum is 14.

The square root of 11651 is about 107.9397980358. The cubic root of 11651 is about 22.6701503681.

The spelling of 11651 in words is "eleven thousand, six hundred fifty-one".