100991069 has 2 divisors, whose sum is σ = 100991070. Its totient is φ = 100991068.

The previous prime is 100991063. The next prime is 100991071. The reversal of 100991069 is 960199001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 23639044 = 8795^2 + 4862^2 .

It is a cyclic number.

It is not a de Polignac number, because 100991069 - 2¹⁶ = 100925533 is a prime.

It is a super-2 number, since 2×100991069² = 20398392035525522, which contains 22 as substring.

Together with 100991071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100991063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50495534 + 50495535.

It is an arithmetic number, because the mean of its divisors is an integer number (50495535).

Almost surely, 2^100991069 is an apocalyptic number.

It is an amenable number.

100991069 is a deficient number, since it is larger than the sum of its proper divisors (1).

100991069 is an equidigital number, since it uses as much as digits as its factorization.

100991069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 100991069 is about 10049.4312774405. The cubic root of 100991069 is about 465.6872237250.

The spelling of 100991069 in words is "one hundred million, nine hundred ninety-one thousand, sixty-nine".