It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1971959 is a prime.
It is a Duffinian number.
It is a congruent number.
21971959 is an apocalyptic number.
1971959 is a wasteful number, since it uses less digits than its factorization.
1971959 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 179280.
The square root of 1971959 is about 1404.2645762106. The cubic root of 1971959 is about 125.4005073802.
The spelling of 1971959 in words is "one million, nine hundred seventy-one thousand, nine hundred fifty-nine".