100405201 has 4 divisors (see below), whose sum is σ = 108128692. Its totient is φ = 92681712.

The previous prime is 100405199. The next prime is 100405219. The reversal of 100405201 is 102504001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102504001 = 79 ⋅1297519.

It can be written as a sum of positive squares in 2 ways, for example, as 17230801 + 83174400 = 4151^2 + 9120^2 .

It is a cyclic number.

It is not a de Polignac number, because 100405201 - 2¹ = 100405199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7723477 = 100405201 / (1 + 0 + 0 + 4 + 0 + 5 + 2 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100405231) 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, 3861726 + ... + 3861751.

It is an arithmetic number, because the mean of its divisors is an integer number (27032173).

Almost surely, 2^100405201 is an apocalyptic number.

It is an amenable number.

100405201 is a deficient number, since it is larger than the sum of its proper divisors (7723491).

100405201 is an equidigital number, since it uses as much as digits as its factorization.

100405201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7723490.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 100405201 is about 10020.2395679944. The cubic root of 100405201 is about 464.7849639719.

Adding to 100405201 its reverse (102504001), we get a palindrome (202909202).

The spelling of 100405201 in words is "one hundred million, four hundred five thousand, two hundred one".