100646489 has 2 divisors, whose sum is σ = 100646490. Its totient is φ = 100646488.

The previous prime is 100646479. The next prime is 100646503. The reversal of 100646489 is 984646001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89624089 + 11022400 = 9467^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 100646489 - 2⁴ = 100646473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (100646449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50323244 + 50323245.

It is an arithmetic number, because the mean of its divisors is an integer number (50323245).

Almost surely, 2^100646489 is an apocalyptic number.

It is an amenable number.

100646489 is a deficient number, since it is larger than the sum of its proper divisors (1).

100646489 is an equidigital number, since it uses as much as digits as its factorization.

100646489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 100646489 is about 10032.2723746916. The cubic root of 100646489 is about 465.1569809521.

The spelling of 100646489 in words is "one hundred million, six hundred forty-six thousand, four hundred eighty-nine".