997145 has 4 divisors (see below), whose sum is σ = 1196580. Its totient is φ = 797712.

The previous prime is 997141. The next prime is 997147. The reversal of 997145 is 541799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 583696 = 643^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 997145 - 2² = 997141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99710 + ... + 99719.

It is an arithmetic number, because the mean of its divisors is an integer number (299145).

2⁹⁹⁷¹⁴⁵ is an apocalyptic number.

It is an amenable number.

997145 is a deficient number, since it is larger than the sum of its proper divisors (199435).

997145 is a wasteful number, since it uses less digits than its factorization.

997145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199434.

The product of its digits is 11340, while the sum is 35.

The square root of 997145 is about 998.5714796648. The cubic root of 997145 is about 99.9047426225.

The spelling of 997145 in words is "nine hundred ninety-seven thousand, one hundred forty-five".