1997231 has 2 divisors, whose sum is σ = 1997232. Its totient is φ = 1997230.

The previous prime is 1997213. The next prime is 1997243. The reversal of 1997231 is 1327991.

It is a happy number.

Together with previous prime (1997213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1997231 - 2¹⁰ = 1996207 is a prime.

It is a super-2 number, since 2×1997231² = 7977863334722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998615 + 998616.

It is an arithmetic number, because the mean of its divisors is an integer number (998616).

2^1997231 is an apocalyptic number.

1997231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997231 is an equidigital number, since it uses as much as digits as its factorization.

1997231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 1997231 is about 1413.2342339471. The cubic root of 1997231 is about 125.9339327783.

The spelling of 1997231 in words is "one million, nine hundred ninety-seven thousand, two hundred thirty-one".