101999999 has 8 divisors (see below), whose sum is σ = 109866240. Its totient is φ = 94383576.

The previous prime is 101999969. The next prime is 102000023. The reversal of 101999999 is 999999101.

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

It is a cyclic number.

It is not a de Polignac number, because 101999999 - 2⁸ = 101999743 is a prime.

It is a Duffinian number.

101999999 is a modest number, since divided by 99999 gives 1019 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101999939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61607 + ... + 63240.

It is an arithmetic number, because the mean of its divisors is an integer number (13733280).

Almost surely, 2^101999999 is an apocalyptic number.

101999999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

101999999 is a deficient number, since it is larger than the sum of its proper divisors (7866241).

101999999 is a wasteful number, since it uses less digits than its factorization.

101999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124909.

The product of its (nonzero) digits is 531441, while the sum is 56.

The square root of 101999999 is about 10099.5048888547. The cubic root of 101999999 is about 467.2328713086.

The spelling of 101999999 in words is "one hundred one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".