100681391 has 2 divisors, whose sum is σ = 100681392. Its totient is φ = 100681390.

The previous prime is 100681349. The next prime is 100681421. The reversal of 100681391 is 193186001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100681391 - 2²⁶ = 33572527 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 (100684391) 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, 50340695 + 50340696.

It is an arithmetic number, because the mean of its divisors is an integer number (50340696).

Almost surely, 2^100681391 is an apocalyptic number.

100681391 is a deficient number, since it is larger than the sum of its proper divisors (1).

100681391 is an equidigital number, since it uses as much as digits as its factorization.

100681391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 100681391 is about 10034.0117101785. The cubic root of 100681391 is about 465.2107434921.

The spelling of 100681391 in words is "one hundred million, six hundred eighty-one thousand, three hundred ninety-one".