42651 has 12 divisors (see below), whose sum is σ = 70512.
Its totient is φ = 24336.
The previous prime is 42649. The next prime is 42667. The reversal of 42651 is 15624.
It is a happy number.
It is not a de Polignac number, because 42651 - 21 = 42649 is a prime.
42651 is a lucky number.
It is a nialpdrome in base 15.
It is not an unprimeable number, because it can be changed into a prime (42611) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276 + ... + 401.
It is an arithmetic number, because the mean of its divisors is an integer number (5876).
242651 is an apocalyptic number.
42651 is a deficient number, since it is larger than the sum of its proper divisors (27861).
42651 is a wasteful number, since it uses less digits than its factorization.
42651 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 690 (or 687 counting only the distinct ones).
The product of its digits is 240, while the sum is 18.
The square root of 42651 is about 206.5211853539.
The cubic root of 42651 is about 34.9389411615.
The spelling of 42651 in words is "forty-two thousand, six hundred fifty-one".