100398091 has 2 divisors, whose sum is σ = 100398092. Its totient is φ = 100398090.

The previous prime is 100398061. The next prime is 100398139. The reversal of 100398091 is 190893001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100398091 - 2¹⁹ = 99873803 is a prime.

It is not a weakly prime, because it can be changed into another prime (100398031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50199045 + 50199046.

It is an arithmetic number, because the mean of its divisors is an integer number (50199046).

Almost surely, 2^100398091 is an apocalyptic number.

100398091 is a deficient number, since it is larger than the sum of its proper divisors (1).

100398091 is an equidigital number, since it uses as much as digits as its factorization.

100398091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 100398091 is about 10019.8847797767. The cubic root of 100398091 is about 464.7739927637.

The spelling of 100398091 in words is "one hundred million, three hundred ninety-eight thousand, ninety-one".