651689 has 2 divisors, whose sum is σ = 651690. Its totient is φ = 651688.

The previous prime is 651683. The next prime is 651697. The reversal of 651689 is 986156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 267289 = 620^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 651689 - 2¹² = 647593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (651683) 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 as a sum of consecutive naturals, namely, 325844 + 325845.

It is an arithmetic number, because the mean of its divisors is an integer number (325845).

2⁶⁵¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

651689 is a deficient number, since it is larger than the sum of its proper divisors (1).

651689 is an equidigital number, since it uses as much as digits as its factorization.

651689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 651689 is about 807.2725685913. The cubic root of 651689 is about 86.6988752738.

The spelling of 651689 in words is "six hundred fifty-one thousand, six hundred eighty-nine".