651983 has 4 divisors (see below), whose sum is σ = 656880. Its totient is φ = 647088.

The previous prime is 651971. The next prime is 651997. The reversal of 651983 is 389156.

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 651983 - 2⁸ = 651727 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2243 + ... + 2516.

It is an arithmetic number, because the mean of its divisors is an integer number (164220).

2⁶⁵¹⁹⁸³ is an apocalyptic number.

651983 is a deficient number, since it is larger than the sum of its proper divisors (4897).

651983 is a wasteful number, since it uses less digits than its factorization.

651983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4896.

The product of its digits is 6480, while the sum is 32.

The square root of 651983 is about 807.4546426890. The cubic root of 651983 is about 86.7119109586.

It can be divided in two parts, 65 and 1983, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 651983 in words is "six hundred fifty-one thousand, nine hundred eighty-three".