654637 has 4 divisors (see below), whose sum is σ = 656316. Its totient is φ = 652960.

The previous prime is 654629. The next prime is 654671. The reversal of 654637 is 736456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 184041 + 470596 = 429^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 654637 - 2³ = 654629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 654599 and 654608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654697) 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, 87 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (164079).

2⁶⁵⁴⁶³⁷ is an apocalyptic number.

It is an amenable number.

654637 is a deficient number, since it is larger than the sum of its proper divisors (1679).

654637 is a wasteful number, since it uses less digits than its factorization.

654637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its digits is 15120, while the sum is 31.

The square root of 654637 is about 809.0964095829. The cubic root of 654637 is about 86.8294098562.

The spelling of 654637 in words is "six hundred fifty-four thousand, six hundred thirty-seven".