931993 has 4 divisors (see below), whose sum is σ = 957220. Its totient is φ = 906768.

The previous prime is 931981. The next prime is 931999. The reversal of 931993 is 399139.

It is a happy number.

931993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399139 = 13 ⋅30703.

It can be written as a sum of positive squares in 2 ways, for example, as 870489 + 61504 = 933^2 + 248^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-931993 is a prime.

It is a super-2 number, since 2×931993² = 1737221904098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (931999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12558 + ... + 12631.

It is an arithmetic number, because the mean of its divisors is an integer number (239305).

2⁹³¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

931993 is a deficient number, since it is larger than the sum of its proper divisors (25227).

931993 is a wasteful number, since it uses less digits than its factorization.

931993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25226.

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

The square root of 931993 is about 965.3978454503. The cubic root of 931993 is about 97.6796774450.

The spelling of 931993 in words is "nine hundred thirty-one thousand, nine hundred ninety-three".