100641191 has 4 divisors (see below), whose sum is σ = 115018512. Its totient is φ = 86263872.

The previous prime is 100641187. The next prime is 100641217. The reversal of 100641191 is 191146001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191146001 = 61 ⋅3133541.

It is a cyclic number.

It is not a de Polignac number, because 100641191 - 2² = 100641187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100641161) 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 in 3 ways as a sum of consecutive naturals, for example, 7188650 + ... + 7188663.

It is an arithmetic number, because the mean of its divisors is an integer number (28754628).

Almost surely, 2^100641191 is an apocalyptic number.

100641191 is a deficient number, since it is larger than the sum of its proper divisors (14377321).

100641191 is an equidigital number, since it uses as much as digits as its factorization.

100641191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14377320.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 100641191 is about 10032.0083233618. The cubic root of 100641191 is about 465.1488189025.

Adding to 100641191 its reverse (191146001), we get a palindrome (291787192).

The spelling of 100641191 in words is "one hundred million, six hundred forty-one thousand, one hundred ninety-one".