100508609 has 4 divisors (see below), whose sum is σ = 100528980. Its totient is φ = 100488240.

The previous prime is 100508599. The next prime is 100508623. The reversal of 100508609 is 906805001.

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 92929600 + 7579009 = 9640^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 100508609 - 2¹⁶ = 100443073 is a prime.

It is a super-2 number, since 2×100508609² = 20203960966229762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100508659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2399 + ... + 14379.

It is an arithmetic number, because the mean of its divisors is an integer number (25132245).

Almost surely, 2^100508609 is an apocalyptic number.

It is an amenable number.

100508609 is a deficient number, since it is larger than the sum of its proper divisors (20371).

100508609 is an equidigital number, since it uses as much as digits as its factorization.

100508609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 100508609 is about 10025.3981965805. The cubic root of 100508609 is about 464.9444709581.

The spelling of 100508609 in words is "one hundred million, five hundred eight thousand, six hundred nine".