100491555 has 32 divisors (see below), whose sum is σ = 164275200. Its totient is φ = 52445952.

The previous prime is 100491509. The next prime is 100491563. The reversal of 100491555 is 555194001.

It is not a de Polignac number, because 100491555 - 2⁷ = 100491427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162036 + ... + 162654.

It is an arithmetic number, because the mean of its divisors is an integer number (5133600).

Almost surely, 2^100491555 is an apocalyptic number.

100491555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100491555 is a deficient number, since it is larger than the sum of its proper divisors (63783645).

100491555 is a wasteful number, since it uses less digits than its factorization.

100491555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 100491555 is about 10024.5476207159. The cubic root of 100491555 is about 464.9181726751.

The spelling of 100491555 in words is "one hundred million, four hundred ninety-one thousand, five hundred fifty-five".