100491085 has 8 divisors (see below), whose sum is σ = 120853656. Its totient is φ = 80216640.

The previous prime is 100491067. The next prime is 100491091. The reversal of 100491085 is 580194001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1408969 + 99082116 = 1187^2 + 9954^2 .

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

It is not a de Polignac number, because 100491085 - 2⁹ = 100490573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19494 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (15106707).

Almost surely, 2^100491085 is an apocalyptic number.

It is an amenable number.

100491085 is a deficient number, since it is larger than the sum of its proper divisors (20362571).

100491085 is an equidigital number, since it uses as much as digits as its factorization.

100491085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44063.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 100491085 is about 10024.5241782341. The cubic root of 100491085 is about 464.9174478650.

The spelling of 100491085 in words is "one hundred million, four hundred ninety-one thousand, eighty-five".