658649 has 2 divisors, whose sum is σ = 658650. Its totient is φ = 658648.

The previous prime is 658643. The next prime is 658663. The reversal of 658649 is 946856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 196249 = 680^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 658649 - 2⁴ = 658633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 658649.

It is not a weakly prime, because it can be changed into another prime (658643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329324 + 329325.

It is an arithmetic number, because the mean of its divisors is an integer number (329325).

2⁶⁵⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

658649 is a deficient number, since it is larger than the sum of its proper divisors (1).

658649 is an equidigital number, since it uses as much as digits as its factorization.

658649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 658649 is about 811.5719315008. The cubic root of 658649 is about 87.0064292602.

The spelling of 658649 in words is "six hundred fifty-eight thousand, six hundred forty-nine".