100781393 has 2 divisors, whose sum is σ = 100781394. Its totient is φ = 100781392.

The previous prime is 100781371. The next prime is 100781411. The reversal of 100781393 is 393187001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75550864 + 25230529 = 8692^2 + 5023^2 .

It is a cyclic number.

It is not a de Polignac number, because 100781393 - 2²⁴ = 84004177 is a prime.

It is not a weakly prime, because it can be changed into another prime (100781693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50390696 + 50390697.

It is an arithmetic number, because the mean of its divisors is an integer number (50390697).

Almost surely, 2^100781393 is an apocalyptic number.

It is an amenable number.

100781393 is a deficient number, since it is larger than the sum of its proper divisors (1).

100781393 is an equidigital number, since it uses as much as digits as its factorization.

100781393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 100781393 is about 10038.9936248610. The cubic root of 100781393 is about 465.3647163700.

The spelling of 100781393 in words is "one hundred million, seven hundred eighty-one thousand, three hundred ninety-three".