997210580909 has 2 divisors, whose sum is σ = 997210580910. Its totient is φ = 997210580908.

The previous prime is 997210580869. The next prime is 997210580969. The reversal of 997210580909 is 909085012799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991468275625 + 5742305284 = 995725^2 + 75778^2 .

It is a cyclic number.

It is not a de Polignac number, because 997210580909 - 2²⁴ = 997193803693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997210580969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498605290454 + 498605290455.

It is an arithmetic number, because the mean of its divisors is an integer number (498605290455).

Almost surely, 2^997210580909 is an apocalyptic number.

It is an amenable number.

997210580909 is a deficient number, since it is larger than the sum of its proper divisors (1).

997210580909 is an equidigital number, since it uses as much as digits as its factorization.

997210580909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 59.

The spelling of 997210580909 in words is "nine hundred ninety-seven billion, two hundred ten million, five hundred eighty thousand, nine hundred nine".