993706681 has 8 divisors (see below), whose sum is σ = 1100224224. Its totient is φ = 889885920.

The previous prime is 993706667. The next prime is 993706687. The reversal of 993706681 is 186607399.

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

It is not a de Polignac number, because 993706681 - 2²³ = 985318073 is a prime.

It is a super-2 number, since 2×993706681² = 1974905935728071522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (993706687) 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 7 ways as a sum of consecutive naturals, for example, 673420 + ... + 674893.

It is an arithmetic number, because the mean of its divisors is an integer number (137528028).

Almost surely, 2^993706681 is an apocalyptic number.

It is an amenable number.

993706681 is a deficient number, since it is larger than the sum of its proper divisors (106517543).

993706681 is a wasteful number, since it uses less digits than its factorization.

993706681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348391.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 993706681 is about 31523.1134407755. The cubic root of 993706681 is about 997.8978108976.

The spelling of 993706681 in words is "nine hundred ninety-three million, seven hundred six thousand, six hundred eighty-one".