100487909 has 4 divisors (see below), whose sum is σ = 100861740. Its totient is φ = 100114080.

The previous prime is 100487887. The next prime is 100487911. The reversal of 100487909 is 909784001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21669025 + 78818884 = 4655^2 + 8878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100487909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100487999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186512 + ... + 187049.

It is an arithmetic number, because the mean of its divisors is an integer number (25215435).

Almost surely, 2^100487909 is an apocalyptic number.

It is an amenable number.

100487909 is a deficient number, since it is larger than the sum of its proper divisors (373831).

100487909 is an equidigital number, since it uses as much as digits as its factorization.

100487909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373830.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 100487909 is about 10024.3657654736. The cubic root of 100487909 is about 464.9125499401.

The spelling of 100487909 in words is "one hundred million, four hundred eighty-seven thousand, nine hundred nine".