100648421 has 2 divisors, whose sum is σ = 100648422. Its totient is φ = 100648420.

The previous prime is 100648417. The next prime is 100648433. The reversal of 100648421 is 124846001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 2856100 = 9889^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 100648421 - 2² = 100648417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100648441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50324210 + 50324211.

It is an arithmetic number, because the mean of its divisors is an integer number (50324211).

Almost surely, 2^100648421 is an apocalyptic number.

It is an amenable number.

100648421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100648421 is an equidigital number, since it uses as much as digits as its factorization.

100648421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 100648421 is about 10032.3686634812. The cubic root of 100648421 is about 465.1599573021.

The spelling of 100648421 in words is "one hundred million, six hundred forty-eight thousand, four hundred twenty-one".