100006391 has 2 divisors, whose sum is σ = 100006392. Its totient is φ = 100006390.

The previous prime is 100006381. The next prime is 100006397. The reversal of 100006391 is 193600001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100006391 - 2⁶ = 100006327 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 (100006397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50003195 + 50003196.

It is an arithmetic number, because the mean of its divisors is an integer number (50003196).

Almost surely, 2^100006391 is an apocalyptic number.

100006391 is a deficient number, since it is larger than the sum of its proper divisors (1).

100006391 is an equidigital number, since it uses as much as digits as its factorization.

100006391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 100006391 is about 10000.3195448946. The cubic root of 100006391 is about 464.1687712820.

Adding to 100006391 its reverse (193600001), we get a palindrome (293606392).

The spelling of 100006391 in words is "one hundred million, six thousand, three hundred ninety-one".