100020191 has 2 divisors, whose sum is σ = 100020192. Its totient is φ = 100020190.

The previous prime is 100020149. The next prime is 100020233. The reversal of 100020191 is 191020001.

It is a balanced prime because it is at equal distance from previous prime (100020149) and next prime (100020233).

It is an emirp because it is prime and its reverse (191020001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100020191 - 2¹⁰ = 100019167 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010095 + 50010096.

It is an arithmetic number, because the mean of its divisors is an integer number (50010096).

Almost surely, 2^100020191 is an apocalyptic number.

100020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

100020191 is an equidigital number, since it uses as much as digits as its factorization.

100020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 100020191 is about 10001.0094990456. The cubic root of 100020191 is about 464.1901206990.

Adding to 100020191 its reverse (191020001), we get a palindrome (291040192).

The spelling of 100020191 in words is "one hundred million, twenty thousand, one hundred ninety-one".