100504991 has 2 divisors, whose sum is σ = 100504992. Its totient is φ = 100504990.

The previous prime is 100504979. The next prime is 100505011. The reversal of 100504991 is 199405001.

It is a weak prime.

It is an emirp because it is prime and its reverse (199405001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100504991 - 2¹⁰ = 100503967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100504951) 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, 50252495 + 50252496.

It is an arithmetic number, because the mean of its divisors is an integer number (50252496).

Almost surely, 2^100504991 is an apocalyptic number.

100504991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100504991 is an equidigital number, since it uses as much as digits as its factorization.

100504991 is an odious number, because the sum of its binary digits is odd.

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

The square root of 100504991 is about 10025.2177532461. The cubic root of 100504991 is about 464.9388920354.

Adding to 100504991 its reverse (199405001), we get a palindrome (299909992).

The spelling of 100504991 in words is "one hundred million, five hundred four thousand, nine hundred ninety-one".