100684391 has 2 divisors, whose sum is σ = 100684392. Its totient is φ = 100684390.

The previous prime is 100684379. The next prime is 100684393. The reversal of 100684391 is 193486001.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (193486001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100684391 - 2²² = 96490087 is a prime.

Together with 100684393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100684393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50342195 + 50342196.

It is an arithmetic number, because the mean of its divisors is an integer number (50342196).

Almost surely, 2^100684391 is an apocalyptic number.

100684391 is a deficient number, since it is larger than the sum of its proper divisors (1).

100684391 is an equidigital number, since it uses as much as digits as its factorization.

100684391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 100684391 is about 10034.1612006186. The cubic root of 100684391 is about 465.2153640692.

The spelling of 100684391 in words is "one hundred million, six hundred eighty-four thousand, three hundred ninety-one".