609651 has 12 divisors (see below), whose sum is σ = 1006512. Its totient is φ = 348336.

The previous prime is 609641. The next prime is 609673. The reversal of 609651 is 156906.

609651 is a `hidden beast` number, since 6 + 0 + 9 + 651 = 666.

It is not a de Polignac number, because 609651 - 2⁵ = 609619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (609601) 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 11 ways as a sum of consecutive naturals, for example, 4776 + ... + 4901.

It is an arithmetic number, because the mean of its divisors is an integer number (83876).

2⁶⁰⁹⁶⁵¹ is an apocalyptic number.

609651 is a deficient number, since it is larger than the sum of its proper divisors (396861).

609651 is a wasteful number, since it uses less digits than its factorization.

609651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9690 (or 9687 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 609651 is about 780.8015112690. The cubic root of 609651 is about 84.7930837928.

The spelling of 609651 in words is "six hundred nine thousand, six hundred fifty-one".