100642187 has 2 divisors, whose sum is σ = 100642188. Its totient is φ = 100642186.

The previous prime is 100642163. The next prime is 100642189. The reversal of 100642187 is 781246001.

It is a strong prime.

It is an emirp because it is prime and its reverse (781246001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100642187 - 2⁶ = 100642123 is a prime.

Together with 100642189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100642189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50321093 + 50321094.

It is an arithmetic number, because the mean of its divisors is an integer number (50321094).

Almost surely, 2^100642187 is an apocalyptic number.

100642187 is a deficient number, since it is larger than the sum of its proper divisors (1).

100642187 is an equidigital number, since it uses as much as digits as its factorization.

100642187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 100642187 is about 10032.0579643461. The cubic root of 100642187 is about 465.1503533527.

Adding to 100642187 its reverse (781246001), we get a palindrome (881888188).

The spelling of 100642187 in words is "one hundred million, six hundred forty-two thousand, one hundred eighty-seven".