997166 has 4 divisors (see below), whose sum is σ = 1495752. Its totient is φ = 498582.

The previous prime is 997163. The next prime is 997201. The reversal of 997166 is 661799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661799 = 397 ⋅1667.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997166.

It is not an unprimeable number, because it can be changed into a prime (997163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249290 + ... + 249293.

It is an arithmetic number, because the mean of its divisors is an integer number (373938).

2⁹⁹⁷¹⁶⁶ is an apocalyptic number.

997166 is a deficient number, since it is larger than the sum of its proper divisors (498586).

997166 is a wasteful number, since it uses less digits than its factorization.

997166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498585.

The product of its digits is 20412, while the sum is 38.

The square root of 997166 is about 998.5819946304. The cubic root of 997166 is about 99.9054439531.

The spelling of 997166 in words is "nine hundred ninety-seven thousand, one hundred sixty-six".