993656481 has 4 divisors (see below), whose sum is σ = 1324875312. Its totient is φ = 662437652.

The previous prime is 993656473. The next prime is 993656491. The reversal of 993656481 is 184656399.

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 a cyclic number.

It is not a de Polignac number, because 993656481 - 2³ = 993656473 is a prime.

It is a super-2 number, since 2×993656481² = 1974706404466606722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (993656491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165609411 + ... + 165609416.

It is an arithmetic number, because the mean of its divisors is an integer number (331218828).

Almost surely, 2^993656481 is an apocalyptic number.

It is an amenable number.

993656481 is a deficient number, since it is larger than the sum of its proper divisors (331218831).

993656481 is a wasteful number, since it uses less digits than its factorization.

993656481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331218830.

The product of its digits is 1399680, while the sum is 51.

The square root of 993656481 is about 31522.3171895722. The cubic root of 993656481 is about 997.8810067056.

The spelling of 993656481 in words is "nine hundred ninety-three million, six hundred fifty-six thousand, four hundred eighty-one".