1997291 has 4 divisors (see below), whose sum is σ = 2011800. Its totient is φ = 1982784.

The previous prime is 1997269. The next prime is 1997293. The reversal of 1997291 is 1927991.

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

It is a cyclic number.

It is not a de Polignac number, because 1997291 - 2¹⁴ = 1980907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997293) 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, 7046 + ... + 7323.

It is an arithmetic number, because the mean of its divisors is an integer number (502950).

2^1997291 is an apocalyptic number.

1997291 is a deficient number, since it is larger than the sum of its proper divisors (14509).

1997291 is a wasteful number, since it uses less digits than its factorization.

1997291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14508.

The product of its digits is 10206, while the sum is 38.

The square root of 1997291 is about 1413.2554616912. The cubic root of 1997291 is about 125.9351938510.

The spelling of 1997291 in words is "one million, nine hundred ninety-seven thousand, two hundred ninety-one".