651963 has 16 divisors (see below), whose sum is σ = 953120. Its totient is φ = 393984.

The previous prime is 651943. The next prime is 651971. The reversal of 651963 is 369156.

It is a happy number.

It is not a de Polignac number, because 651963 - 2¹⁸ = 389819 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 651963.

It is not an unprimeable number, because it can be changed into a prime (651913) 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 15 ways as a sum of consecutive naturals, for example, 2733 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (59570).

2⁶⁵¹⁹⁶³ is an apocalyptic number.

651963 is a deficient number, since it is larger than the sum of its proper divisors (301157).

651963 is a wasteful number, since it uses less digits than its factorization.

651963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318.

The product of its digits is 4860, while the sum is 30.

The square root of 651963 is about 807.4422579974. The cubic root of 651963 is about 86.7110243016.

The spelling of 651963 in words is "six hundred fifty-one thousand, nine hundred sixty-three".