997084909 has 2 divisors, whose sum is σ = 997084910. Its totient is φ = 997084908.

The previous prime is 997084883. The next prime is 997084927. The reversal of 997084909 is 909480799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749116900 + 247968009 = 27370^2 + 15747^2 .

It is an emirp because it is prime and its reverse (909480799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997084909 - 2⁵ = 997084877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997084909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997084999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498542454 + 498542455.

It is an arithmetic number, because the mean of its divisors is an integer number (498542455).

Almost surely, 2^997084909 is an apocalyptic number.

It is an amenable number.

997084909 is a deficient number, since it is larger than the sum of its proper divisors (1).

997084909 is an equidigital number, since it uses as much as digits as its factorization.

997084909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The square root of 997084909 is about 31576.6513265736. The cubic root of 997084909 is about 999.0273572728.

The spelling of 997084909 in words is "nine hundred ninety-seven million, eighty-four thousand, nine hundred nine".