100866987 has 24 divisors (see below), whose sum is σ = 158125968. Its totient is φ = 61588800.

The previous prime is 100866923. The next prime is 100866989. The reversal of 100866987 is 789668001.

It is a happy number.

It is not a de Polignac number, because 100866987 - 2⁶ = 100866923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100866989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12037 + ... + 18617.

It is an arithmetic number, because the mean of its divisors is an integer number (6588582).

Almost surely, 2^100866987 is an apocalyptic number.

100866987 is a deficient number, since it is larger than the sum of its proper divisors (57258981).

100866987 is a wasteful number, since it uses less digits than its factorization.

100866987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731 (or 6728 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 100866987 is about 10043.2557968022. The cubic root of 100866987 is about 465.4964244002.

The spelling of 100866987 in words is "one hundred million, eight hundred sixty-six thousand, nine hundred eighty-seven".