1997121 has 8 divisors (see below), whose sum is σ = 3043264. Its totient is φ = 1141200.

The previous prime is 1997119. The next prime is 1997129. The reversal of 1997121 is 1217991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1997121 - 2¹ = 1997119 is a prime.

1997121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1997129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47530 + ... + 47571.

It is an arithmetic number, because the mean of its divisors is an integer number (380408).

2^1997121 is an apocalyptic number.

It is an amenable number.

1997121 is a deficient number, since it is larger than the sum of its proper divisors (1046143).

1997121 is an equidigital number, since it uses as much as digits as its factorization.

1997121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95111.

The product of its digits is 1134, while the sum is 30.

The square root of 1997121 is about 1413.1953155880. The cubic root of 1997121 is about 125.9316207461.

The spelling of 1997121 in words is "one million, nine hundred ninety-seven thousand, one hundred twenty-one".