2651 has 4 divisors (see below), whose sum is σ = 2904. Its totient is φ = 2400.

The previous prime is 2647. The next prime is 2657. The reversal of 2651 is 1562.

2651 is nontrivially palindromic in base 15.

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 2651 - 2^{2} = 2647 is a prime.

2651 is a nontrivial repdigit in base 15.

It is a plaindrome in base 13 and base 15.

It is a nialpdrome in base 14 and base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (2657) 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, 110 + ... + 131.

It is an arithmetic number, because the mean of its divisors is an integer number (726).

2651 is a deficient number, since it is larger than the sum of its proper divisors (253).

2651 is a wasteful number, since it uses less digits than its factorization.

2651 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 60, while the sum is 14.

The square root of 2651 is about 51.4878626474. The cubic root of 2651 is about 13.8400154811.

Subtracting from 2651 its reverse (1562), we obtain a square (1089 = 33^{2}).

It can be divided in two parts, 26 and 51, that multiplied together give a triangular number (1326 = T_{51}).

The spelling of 2651 in words is "two thousand, six hundred fifty-one".

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