100428187 has 2 divisors, whose sum is σ = 100428188. Its totient is φ = 100428186.

The previous prime is 100428169. The next prime is 100428227. The reversal of 100428187 is 781824001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100428187 - 2⁷ = 100428059 is a prime.

It is not a weakly prime, because it can be changed into another prime (100423187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50214093 + 50214094.

It is an arithmetic number, because the mean of its divisors is an integer number (50214094).

Almost surely, 2^100428187 is an apocalyptic number.

100428187 is a deficient number, since it is larger than the sum of its proper divisors (1).

100428187 is an equidigital number, since it uses as much as digits as its factorization.

100428187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 100428187 is about 10021.3864809217. The cubic root of 100428187 is about 464.8204293724.

The spelling of 100428187 in words is "one hundred million, four hundred twenty-eight thousand, one hundred eighty-seven".