654851 has 4 divisors (see below), whose sum is σ = 668832. Its totient is φ = 640872.

The previous prime is 654839. The next prime is 654853. The reversal of 654851 is 158456.

It is a happy number.

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 654851 - 2¹⁴ = 638467 is a prime.

It is a super-3 number, since 3×654851³ = 842458933339971153, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6920 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (167208).

2⁶⁵⁴⁸⁵¹ is an apocalyptic number.

654851 is a deficient number, since it is larger than the sum of its proper divisors (13981).

654851 is a wasteful number, since it uses less digits than its factorization.

654851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13980.

The product of its digits is 4800, while the sum is 29.

The square root of 654851 is about 809.2286450689. The cubic root of 654851 is about 86.8388702998.

The spelling of 654851 in words is "six hundred fifty-four thousand, eight hundred fifty-one".