100739209 has 4 divisors (see below), whose sum is σ = 100759680. Its totient is φ = 100718740.

The previous prime is 100739203. The next prime is 100739213. The reversal of 100739209 is 902937001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902937001 = 2203 ⋅409867.

It is a cyclic number.

It is not a de Polignac number, because 100739209 - 2³ = 100739201 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100739201) 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, 2112 + ... + 14350.

It is an arithmetic number, because the mean of its divisors is an integer number (25189920).

Almost surely, 2^100739209 is an apocalyptic number.

It is an amenable number.

100739209 is a deficient number, since it is larger than the sum of its proper divisors (20471).

100739209 is an equidigital number, since it uses as much as digits as its factorization.

100739209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20470.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 100739209 is about 10036.8923975502. The cubic root of 100739209 is about 465.2997781765.

The spelling of 100739209 in words is "one hundred million, seven hundred thirty-nine thousand, two hundred nine".