100561009 has 4 divisors (see below), whose sum is σ = 104028660. Its totient is φ = 97093360.

The previous prime is 100561007. The next prime is 100561031. The reversal of 100561009 is 900165001.

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 52881984 + 47679025 = 7272^2 + 6905^2 .

It is a cyclic number.

It is not a de Polignac number, because 100561009 - 2¹ = 100561007 is a prime.

It is a super-2 number, since 2×100561009² = 20225033062196162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100561007) 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, 1733782 + ... + 1733839.

It is an arithmetic number, because the mean of its divisors is an integer number (26007165).

Almost surely, 2^100561009 is an apocalyptic number.

It is an amenable number.

100561009 is a deficient number, since it is larger than the sum of its proper divisors (3467651).

100561009 is an equidigital number, since it uses as much as digits as its factorization.

100561009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467650.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 100561009 is about 10028.0112185817. The cubic root of 100561009 is about 465.0252562688.

The spelling of 100561009 in words is "one hundred million, five hundred sixty-one thousand, nine".