100120232009 has 6 divisors (see below), whose sum is σ = 116466392394. Its totient is φ = 85817341680.

The previous prime is 100120231969. The next prime is 100120232033. The reversal of 100120232009 is 900232021001.

It can be written as a sum of positive squares in only one way, i.e., 81152056384 + 18968175625 = 284872^2 + 137725^2 .

It is not a de Polignac number, because 100120232009 - 2¹⁶ = 100120166473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100120232209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1021634972 + ... + 1021635069.

It is an arithmetic number, because the mean of its divisors is an integer number (19411065399).

Almost surely, 2^100120232009 is an apocalyptic number.

It is an amenable number.

100120232009 is a deficient number, since it is larger than the sum of its proper divisors (16346160385).

100120232009 is an equidigital number, since it uses as much as digits as its factorization.

100120232009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043270055 (or 2043270048 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 100120232009 in words is "one hundred billion, one hundred twenty million, two hundred thirty-two thousand, nine".