100399813 has 2 divisors, whose sum is σ = 100399814. Its totient is φ = 100399812.

The previous prime is 100399727. The next prime is 100399829. The reversal of 100399813 is 318993001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 32798529 = 8222^2 + 5727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100399813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100399843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50199906 + 50199907.

It is an arithmetic number, because the mean of its divisors is an integer number (50199907).

Almost surely, 2^100399813 is an apocalyptic number.

It is an amenable number.

100399813 is a deficient number, since it is larger than the sum of its proper divisors (1).

100399813 is an equidigital number, since it uses as much as digits as its factorization.

100399813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 100399813 is about 10019.9707085400. The cubic root of 100399813 is about 464.7766499730.

The spelling of 100399813 in words is "one hundred million, three hundred ninety-nine thousand, eight hundred thirteen".