100555399 has 12 divisors (see below), whose sum is σ = 117157800. Its totient is φ = 86053968.

The previous prime is 100555393. The next prime is 100555421. The reversal of 100555399 is 993555001.

It is not a de Polignac number, because 100555399 - 2⁷ = 100555271 is a prime.

It is a super-2 number, since 2×100555399² = 20222776536098402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100555393) 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 in 11 ways as a sum of consecutive naturals, for example, 40897 + ... + 43285.

It is an arithmetic number, because the mean of its divisors is an integer number (9763150).

Almost surely, 2^100555399 is an apocalyptic number.

100555399 is a deficient number, since it is larger than the sum of its proper divisors (16602401).

100555399 is an equidigital number, since it uses as much as digits as its factorization.

100555399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262 (or 3255 counting only the distinct ones).

The product of its (nonzero) digits is 30375, while the sum is 37.

The square root of 100555399 is about 10027.7314982004. The cubic root of 100555399 is about 465.0166086487.

The spelling of 100555399 in words is "one hundred million, five hundred fifty-five thousand, three hundred ninety-nine".