100450991 has 4 divisors (see below), whose sum is σ = 101173800. Its totient is φ = 99728184.

The previous prime is 100450951. The next prime is 100450997. The reversal of 100450991 is 199054001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100450991 - 2⁶ = 100450927 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 (100450997) 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 3 ways as a sum of consecutive naturals, for example, 361196 + ... + 361473.

It is an arithmetic number, because the mean of its divisors is an integer number (25293450).

Almost surely, 2^100450991 is an apocalyptic number.

100450991 is a deficient number, since it is larger than the sum of its proper divisors (722809).

100450991 is an equidigital number, since it uses as much as digits as its factorization.

100450991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722808.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 100450991 is about 10022.5241830589. The cubic root of 100450991 is about 464.8556086158.

The spelling of 100450991 in words is "one hundred million, four hundred fifty thousand, nine hundred ninety-one".