997991282 has 8 divisors (see below), whose sum is σ = 1498935900. Its totient is φ = 498345984.

The previous prime is 997991263. The next prime is 997991287. The reversal of 997991282 is 282199799.

It is a happy number.

It is a Cunningham number, because it is equal to 31591²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 997991281 + 1 = 31591^2 + 1^2 .

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

It is a super-3 number, since 3×997991282³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (997991287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322907 + ... + 325982.

Almost surely, 2^997991282 is an apocalyptic number.

997991282 is a deficient number, since it is larger than the sum of its proper divisors (500944618).

997991282 is a wasteful number, since it uses less digits than its factorization.

997991282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649660.

The product of its digits is 1469664, while the sum is 56.

The square root of 997991282 is about 31591.0000158273. Note that the first 4 decimals coincide. The cubic root of 997991282 is about 999.3299785048.

The spelling of 997991282 in words is "nine hundred ninety-seven million, nine hundred ninety-one thousand, two hundred eighty-two".