651646 has 8 divisors (see below), whose sum is σ = 987840. Its totient is φ = 322368.

The previous prime is 651641. The next prime is 651647. The reversal of 651646 is 646156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651641) 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, 1486 + ... + 1873.

It is an arithmetic number, because the mean of its divisors is an integer number (123480).

2⁶⁵¹⁶⁴⁶ is an apocalyptic number.

651646 is a deficient number, since it is larger than the sum of its proper divisors (336194).

651646 is a wasteful number, since it uses less digits than its factorization.

651646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458.

The product of its digits is 4320, while the sum is 28.

The square root of 651646 is about 807.2459352638. The cubic root of 651646 is about 86.6969683654.

It can be divided in two parts, 65 and 1646, that added together give a triangular number (1711 = T₅₈).

The spelling of 651646 in words is "six hundred fifty-one thousand, six hundred forty-six".