100649 has 2 divisors, whose sum is σ = 100650. Its totient is φ = 100648.

The previous prime is 100621. The next prime is 100669. The reversal of 100649 is 946001.

It is an a-pointer prime, because the next prime (100669) can be obtained adding 100649 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94249 + 6400 = 307^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 100649 - 2⁸ = 100393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100649.

It is not a weakly prime, because it can be changed into another prime (100609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50324 + 50325.

It is an arithmetic number, because the mean of its divisors is an integer number (50325).

2¹⁰⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

100649 is a deficient number, since it is larger than the sum of its proper divisors (1).

100649 is an equidigital number, since it uses as much as digits as its factorization.

100649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 100649 is about 317.2522655553. The cubic root of 100649 is about 46.5160849275.

It can be divided in two parts, 1006 and 49, that multiplied together give a palindrome (49294).

The spelling of 100649 in words is "one hundred thousand, six hundred forty-nine".