993931 has 4 divisors (see below), whose sum is σ = 1020832. Its totient is φ = 967032.

The previous prime is 993919. The next prime is 993943. The reversal of 993931 is 139399.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139399 = 13 ⋅10723.

It is an interprime number because it is at equal distance from previous prime (993919) and next prime (993943).

It is not a de Polignac number, because 993931 - 2¹¹ = 991883 is a prime.

It is a super-2 number, since 2×993931² = 1975797665522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13395 + ... + 13468.

It is an arithmetic number, because the mean of its divisors is an integer number (255208).

2⁹⁹³⁹³¹ is an apocalyptic number.

993931 is a deficient number, since it is larger than the sum of its proper divisors (26901).

993931 is a wasteful number, since it uses less digits than its factorization.

993931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26900.

The product of its digits is 6561, while the sum is 34.

The square root of 993931 is about 996.9608818805. The cubic root of 993931 is about 99.7972893616.

The spelling of 993931 in words is "nine hundred ninety-three thousand, nine hundred thirty-one".