97550209 has 2 divisors, whose sum is σ = 97550210. Its totient is φ = 97550208.

The previous prime is 97550207. The next prime is 97550213. The reversal of 97550209 is 90205579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82301184 + 15249025 = 9072^2 + 3905^2 .

It is a cyclic number.

It is not a de Polignac number, because 97550209 - 2¹ = 97550207 is a prime.

Together with 97550207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (97550203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48775104 + 48775105.

It is an arithmetic number, because the mean of its divisors is an integer number (48775105).

Almost surely, 2^97550209 is an apocalyptic number.

It is an amenable number.

97550209 is a deficient number, since it is larger than the sum of its proper divisors (1).

97550209 is an equidigital number, since it uses as much as digits as its factorization.

97550209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 97550209 is about 9876.7509333789. The cubic root of 97550209 is about 460.3371960524.

The spelling of 97550209 in words is "ninety-seven million, five hundred fifty thousand, two hundred nine".