997806118 has 4 divisors (see below), whose sum is σ = 1496709180. Its totient is φ = 498903058.

The previous prime is 997806091. The next prime is 997806149. The reversal of 997806118 is 811608799.

997806118 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 811608799 = 31 ⋅26180929.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249451528 + ... + 249451531.

It is an arithmetic number, because the mean of its divisors is an integer number (374177295).

Almost surely, 2^997806118 is an apocalyptic number.

997806118 is a deficient number, since it is larger than the sum of its proper divisors (498903062).

997806118 is a wasteful number, since it uses less digits than its factorization.

997806118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498903061.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 997806118 is about 31588.0692350767. The cubic root of 997806118 is about 999.2681705563.

The spelling of 997806118 in words is "nine hundred ninety-seven million, eight hundred six thousand, one hundred eighteen".