100189505 has 8 divisors (see below), whose sum is σ = 129475752. Its totient is φ = 73986048.

The previous prime is 100189471. The next prime is 100189543. The reversal of 100189505 is 505981001.

It can be written as a sum of positive squares in 4 ways, for example, as 22202944 + 77986561 = 4712^2 + 8831^2 .

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 100189505 - 2⁸ = 100189249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 770624 + ... + 770753.

It is an arithmetic number, because the mean of its divisors is an integer number (16184469).

Almost surely, 2^100189505 is an apocalyptic number.

It is an amenable number.

100189505 is a deficient number, since it is larger than the sum of its proper divisors (29286247).

100189505 is a wasteful number, since it uses less digits than its factorization.

100189505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541395.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 100189505 is about 10009.4707652303. The cubic root of 100189505 is about 464.4518997762.

The spelling of 100189505 in words is "one hundred million, one hundred eighty-nine thousand, five hundred five".