842651 has 4 divisors (see below), whose sum is σ = 879312. Its totient is φ = 805992.

The previous prime is 842627. The next prime is 842657. The reversal of 842651 is 156248.

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 842651 - 2⁶ = 842587 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 842651.

It is not an unprimeable number, because it can be changed into a prime (842657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18296 + ... + 18341.

It is an arithmetic number, because the mean of its divisors is an integer number (219828).

2⁸⁴²⁶⁵¹ is an apocalyptic number.

842651 is a deficient number, since it is larger than the sum of its proper divisors (36661).

842651 is a wasteful number, since it uses less digits than its factorization.

842651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36660.

The product of its digits is 1920, while the sum is 26.

The square root of 842651 is about 917.9602387903. The cubic root of 842651 is about 94.4530341540.

Adding to 842651 its reverse (156248), we get a palindrome (998899).

The spelling of 842651 in words is "eight hundred forty-two thousand, six hundred fifty-one".