1997173 has 2 divisors, whose sum is σ = 1997174. Its totient is φ = 1997172.

The previous prime is 1997161. The next prime is 1997179. The reversal of 1997173 is 3717991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1855044 + 142129 = 1362^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997173 - 2⁵ = 1997141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998586 + 998587.

It is an arithmetic number, because the mean of its divisors is an integer number (998587).

2^1997173 is an apocalyptic number.

It is an amenable number.

1997173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997173 is an equidigital number, since it uses as much as digits as its factorization.

1997173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 37.

The square root of 1997173 is about 1413.2137134913. The cubic root of 1997173 is about 125.9327137174.

The spelling of 1997173 in words is "one million, nine hundred ninety-seven thousand, one hundred seventy-three".