101999866 has 8 divisors (see below), whose sum is σ = 161052480. Its totient is φ = 48315708.

The previous prime is 101999857. The next prime is 101999867. The reversal of 101999866 is 668999101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (101999867) 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 3 ways as a sum of consecutive naturals, for example, 1342066 + ... + 1342141.

It is an arithmetic number, because the mean of its divisors is an integer number (20131560).

Almost surely, 2^101999866 is an apocalyptic number.

101999866 is a deficient number, since it is larger than the sum of its proper divisors (59052614).

101999866 is a wasteful number, since it uses less digits than its factorization.

101999866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684228.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 101999866 is about 10099.4983043714. The cubic root of 101999866 is about 467.2326682302.

The spelling of 101999866 in words is "one hundred one million, nine hundred ninety-nine thousand, eight hundred sixty-six".