997109447 has 2 divisors, whose sum is σ = 997109448. Its totient is φ = 997109446.

The previous prime is 997109431. The next prime is 997109467. The reversal of 997109447 is 744901799.

It is a weak prime.

It is an emirp because it is prime and its reverse (744901799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997109447 - 2⁴ = 997109431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997109395 and 997109404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997109467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498554723 + 498554724.

It is an arithmetic number, because the mean of its divisors is an integer number (498554724).

Almost surely, 2^997109447 is an apocalyptic number.

997109447 is a deficient number, since it is larger than the sum of its proper divisors (1).

997109447 is an equidigital number, since it uses as much as digits as its factorization.

997109447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 997109447 is about 31577.0398707669. The cubic root of 997109447 is about 999.0355524733.

The spelling of 997109447 in words is "nine hundred ninety-seven million, one hundred nine thousand, four hundred forty-seven".