100400491 has 2 divisors, whose sum is σ = 100400492. Its totient is φ = 100400490.

The previous prime is 100400483. The next prime is 100400527. The reversal of 100400491 is 194004001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100400491 - 2³ = 100400483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100400591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50200245 + 50200246.

It is an arithmetic number, because the mean of its divisors is an integer number (50200246).

Almost surely, 2^100400491 is an apocalyptic number.

100400491 is a deficient number, since it is larger than the sum of its proper divisors (1).

100400491 is an equidigital number, since it uses as much as digits as its factorization.

100400491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 100400491 is about 10020.0045409171. The cubic root of 100400491 is about 464.7776961830. Note that the first 3 decimals are identical.

Adding to 100400491 its reverse (194004001), we get a palindrome (294404492).

The spelling of 100400491 in words is "one hundred million, four hundred thousand, four hundred ninety-one".