100904813 has 4 divisors (see below), whose sum is σ = 103365948. Its totient is φ = 98443680.

The previous prime is 100904773. The next prime is 100904821. The reversal of 100904813 is 318409001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318409001 = 53 ⋅6007717.

It can be written as a sum of positive squares in 2 ways, for example, as 47293129 + 53611684 = 6877^2 + 7322^2 .

It is a cyclic number.

It is not a de Polignac number, because 100904813 - 2¹⁴ = 100888429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100904863) 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, 1230506 + ... + 1230587.

It is an arithmetic number, because the mean of its divisors is an integer number (25841487).

Almost surely, 2^100904813 is an apocalyptic number.

It is an amenable number.

100904813 is a deficient number, since it is larger than the sum of its proper divisors (2461135).

100904813 is an equidigital number, since it uses as much as digits as its factorization.

100904813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461134.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 100904813 is about 10045.1387745516. The cubic root of 100904813 is about 465.5546055346.

The spelling of 100904813 in words is "one hundred million, nine hundred four thousand, eight hundred thirteen".