2151 has 6 divisors (see below), whose sum is σ = 3120. Its totient is φ = 1428.
The previous prime is 2143. The next prime is 2153. The reversal of 2151 is 1512.
It is a happy number.
2151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
2151 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.
It is not a de Polignac number, because 2151 - 23 = 2143 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 239 = 2151 / (2 + 1 + 5 + 1).
It is a nialpdrome in base 13 and base 15.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2153) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111 + ... + 128.
It is an arithmetic number, because the mean of its divisors is an integer number (520).
2151 is a deficient number, since it is larger than the sum of its proper divisors (969).
2151 is a wasteful number, since it uses less digits than its factorization.
2151 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 245 (or 242 counting only the distinct ones).
The product of its digits is 10, while the sum is 9.
The square root of 2151 is about 46.3788745012. The cubic root of 2151 is about 12.9086295243.
Adding to 2151 its reverse (1512), we get a palindrome (3663).
It can be divided in two parts, 215 and 1, that added together give a cube (216 = 63).
The spelling of 2151 in words is "two thousand, one hundred fifty-one".
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