20101097 has 2 divisors, whose sum is σ = 20101098. Its totient is φ = 20101096.

The previous prime is 20101093. The next prime is 20101099. The reversal of 20101097 is 79010102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 4648336 = 3931^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101097 - 2² = 20101093 is a prime.

Together with 20101099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20101091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050548 + 10050549.

It is an arithmetic number, because the mean of its divisors is an integer number (10050549).

Almost surely, 2^20101097 is an apocalyptic number.

It is an amenable number.

20101097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101097 is an equidigital number, since it uses as much as digits as its factorization.

20101097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 20101097 is about 4483.4246954755. The cubic root of 20101097 is about 271.8983589742.

Adding to 20101097 its reverse (79010102), we get a palindrome (99111199).

The spelling of 20101097 in words is "twenty million, one hundred one thousand, ninety-seven".