100120091 has 2 divisors, whose sum is σ = 100120092. Its totient is φ = 100120090.

The previous prime is 100120079. The next prime is 100120159. The reversal of 100120091 is 190021001.

It is a weak prime.

It is an emirp because it is prime and its reverse (190021001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100120091 - 2²² = 95925787 is a prime.

It is not a weakly prime, because it can be changed into another prime (100120591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060045 + 50060046.

It is an arithmetic number, because the mean of its divisors is an integer number (50060046).

Almost surely, 2^100120091 is an apocalyptic number.

100120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

100120091 is an equidigital number, since it uses as much as digits as its factorization.

100120091 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 100120091 is about 10006.0027483506. The cubic root of 100120091 is about 464.3446133810.

Adding to 100120091 its reverse (190021001), we get a palindrome (290141092).

The spelling of 100120091 in words is "one hundred million, one hundred twenty thousand, ninety-one".