100403813 has 4 divisors (see below), whose sum is σ = 100601580. Its totient is φ = 100206048.

The previous prime is 100403803. The next prime is 100403843. The reversal of 100403813 is 318304001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318304001 = 31 ⋅10267871.

It can be written as a sum of positive squares in 2 ways, for example, as 94342369 + 6061444 = 9713^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 100403813 - 2⁶ = 100403749 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 (100403803) 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, 98120 + ... + 99137.

It is an arithmetic number, because the mean of its divisors is an integer number (25150395).

Almost surely, 2^100403813 is an apocalyptic number.

It is an amenable number.

100403813 is a deficient number, since it is larger than the sum of its proper divisors (197767).

100403813 is an equidigital number, since it uses as much as digits as its factorization.

100403813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197766.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 100403813 is about 10020.1703079339. The cubic root of 100403813 is about 464.7828222352.

Adding to 100403813 its reverse (318304001), we get a palindrome (418707814).

The spelling of 100403813 in words is "one hundred million, four hundred three thousand, eight hundred thirteen".