100720649 has 2 divisors, whose sum is σ = 100720650. Its totient is φ = 100720648.

The previous prime is 100720637. The next prime is 100720661. The reversal of 100720649 is 946027001.

It is a balanced prime because it is at equal distance from previous prime (100720637) and next prime (100720661).

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 50310649 = 7100^2 + 7093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100720649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100720049) 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, 50360324 + 50360325.

It is an arithmetic number, because the mean of its divisors is an integer number (50360325).

Almost surely, 2^100720649 is an apocalyptic number.

It is an amenable number.

100720649 is a deficient number, since it is larger than the sum of its proper divisors (1).

100720649 is an equidigital number, since it uses as much as digits as its factorization.

100720649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 100720649 is about 10035.9677659905. The cubic root of 100720649 is about 465.2712011065.

The spelling of 100720649 in words is "one hundred million, seven hundred twenty thousand, six hundred forty-nine".