997533818 has 4 divisors (see below), whose sum is σ = 1496300730. Its totient is φ = 498766908.

The previous prime is 997533811. The next prime is 997533833. The reversal of 997533818 is 818335799.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 933485809 + 64048009 = 30553^2 + 8003^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 997533818.

It is not an unprimeable number, because it can be changed into a prime (997533811) 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 as a sum of consecutive naturals, namely, 249383453 + ... + 249383456.

Almost surely, 2^997533818 is an apocalyptic number.

997533818 is a deficient number, since it is larger than the sum of its proper divisors (498766912).

997533818 is a wasteful number, since it uses less digits than its factorization.

997533818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498766911.

The product of its digits is 1632960, while the sum is 53.

The square root of 997533818 is about 31583.7587693422. The cubic root of 997533818 is about 999.1772626222.

The spelling of 997533818 in words is "nine hundred ninety-seven million, five hundred thirty-three thousand, eight hundred eighteen".