100209997 has 2 divisors, whose sum is σ = 100209998. Its totient is φ = 100209996.

The previous prime is 100209979. The next prime is 100210001. The reversal of 100209997 is 799902001.

Together with previous prime (100209979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57972996 + 42237001 = 7614^2 + 6499^2 .

It is a cyclic number.

It is not a de Polignac number, because 100209997 - 2¹⁹ = 99685709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100209937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50104998 + 50104999.

It is an arithmetic number, because the mean of its divisors is an integer number (50104999).

Almost surely, 2^100209997 is an apocalyptic number.

It is an amenable number.

100209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

100209997 is an equidigital number, since it uses as much as digits as its factorization.

100209997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 100209997 is about 10010.4943434378. The cubic root of 100209997 is about 464.4835627716.

The spelling of 100209997 in words is "one hundred million, two hundred nine thousand, nine hundred ninety-seven".