31993673 has 4 divisors (see below), whose sum is σ = 32118420. Its totient is φ = 31868928.

The previous prime is 31993649. The next prime is 31993679. The reversal of 31993673 is 37639913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37639913 = 2459 ⋅15307.

It can be written as a sum of positive squares in 2 ways, for example, as 18939904 + 13053769 = 4352^2 + 3613^2 .

It is a cyclic number.

It is not a de Polignac number, because 31993673 - 2¹² = 31989577 is a prime.

It is a super-2 number, since 2×31993673² = 2047190224061858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31993673.

It is not an unprimeable number, because it can be changed into a prime (31993679) 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, 61988 + ... + 62501.

It is an arithmetic number, because the mean of its divisors is an integer number (8029605).

Almost surely, 2^31993673 is an apocalyptic number.

It is an amenable number.

31993673 is a deficient number, since it is larger than the sum of its proper divisors (124747).

31993673 is a wasteful number, since it uses less digits than its factorization.

31993673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124746.

The product of its digits is 91854, while the sum is 41.

The square root of 31993673 is about 5656.2949887714. The cubic root of 31993673 is about 317.4592850844.

The spelling of 31993673 in words is "thirty-one million, nine hundred ninety-three thousand, six hundred seventy-three".