993631 has 4 divisors (see below), whose sum is σ = 998200. Its totient is φ = 989064.

The previous prime is 993617. The next prime is 993647. The reversal of 993631 is 136399.

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

It is a cyclic number.

It is not a de Polignac number, because 993631 - 2¹⁵ = 960863 is a prime.

It is a super-2 number, since 2×993631² = 1974605128322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 993593 and 993602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1941 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (249550).

2⁹⁹³⁶³¹ is an apocalyptic number.

993631 is a deficient number, since it is larger than the sum of its proper divisors (4569).

993631 is a wasteful number, since it uses less digits than its factorization.

993631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568.

The product of its digits is 4374, while the sum is 31.

The square root of 993631 is about 996.8104132682. The cubic root of 993631 is about 99.7872476855.

The spelling of 993631 in words is "nine hundred ninety-three thousand, six hundred thirty-one".