7651 has 4 divisors (see below), whose sum is σ = 8752. Its totient is φ = 6552.

The previous prime is 7649. The next prime is 7669. The reversal of 7651 is 1567.

7651 = 30² + 31² + ... + 36².

7651 is nontrivially palindromic in base 3.

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

It is a Wieferich number.

It is not a de Polignac number, because 7651 - 2¹ = 7649 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (7621) 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, 540 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (2188).

2⁷⁶⁵¹ is an apocalyptic number.

7651 is the 51-st hex number.

7651 is a deficient number, since it is larger than the sum of its proper divisors (1101).

7651 is a wasteful number, since it uses less digits than its factorization.

7651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its digits is 210, while the sum is 19.

The square root of 7651 is about 87.4699948554. The cubic root of 7651 is about 19.7048318861.

Subtracting from 7651 its reverse (1567), we obtain a square (6084 = 78²).

The spelling of 7651 in words is "seven thousand, six hundred fifty-one".