997549011 has 6 divisors (see below), whose sum is σ = 1440904140. Its totient is φ = 665032668.

The previous prime is 997548977. The next prime is 997549019. The reversal of 997549011 is 110945799.

997549011 is a `hidden beast` number, since 9 + 97 + 549 + 0 + 11 = 666.

It is not a de Polignac number, because 997549011 - 2⁶ = 997548947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997549019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55419381 + ... + 55419398.

It is an arithmetic number, because the mean of its divisors is an integer number (240150690).

Almost surely, 2^997549011 is an apocalyptic number.

997549011 is a deficient number, since it is larger than the sum of its proper divisors (443355129).

997549011 is a wasteful number, since it uses less digits than its factorization.

997549011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110838785 (or 110838782 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 997549011 is about 31583.9992876140. Note that the first 3 decimals coincide. The cubic root of 997549011 is about 999.1823352733.

Adding to 997549011 its sum of digits (45), we get a square (997549056 = 31584²).

The spelling of 997549011 in words is "nine hundred ninety-seven million, five hundred forty-nine thousand, eleven".