993609021 has 4 divisors (see below), whose sum is σ = 1324812032. Its totient is φ = 662406012.

The previous prime is 993609017. The next prime is 993609037. The reversal of 993609021 is 120906399.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 993609021 - 2² = 993609017 is a prime.

It is a super-2 number, since 2×993609021² = 1974517773225156882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993609061) 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, 165601501 + ... + 165601506.

It is an arithmetic number, because the mean of its divisors is an integer number (331203008).

Almost surely, 2^993609021 is an apocalyptic number.

It is an amenable number.

993609021 is a deficient number, since it is larger than the sum of its proper divisors (331203011).

993609021 is a wasteful number, since it uses less digits than its factorization.

993609021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331203010.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 993609021 is about 31521.5643805951. The cubic root of 993609021 is about 997.8651191940.

The spelling of 993609021 in words is "nine hundred ninety-three million, six hundred nine thousand, twenty-one".