100639999 has 2 divisors, whose sum is σ = 100640000. Its totient is φ = 100639998.

The previous prime is 100639997. The next prime is 100640003. The reversal of 100639999 is 999936001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100639999 - 2¹ = 100639997 is a prime.

Together with 100639997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100639991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50319999 + 50320000.

It is an arithmetic number, because the mean of its divisors is an integer number (50320000).

Almost surely, 2^100639999 is an apocalyptic number.

100639999 is a deficient number, since it is larger than the sum of its proper divisors (1).

100639999 is an equidigital number, since it uses as much as digits as its factorization.

100639999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 100639999 is about 10031.9489133468. The cubic root of 100639999 is about 465.1469824788.

The spelling of 100639999 in words is "one hundred million, six hundred thirty-nine thousand, nine hundred ninety-nine".