202031993 has 4 divisors (see below), whose sum is σ = 204589440. Its totient is φ = 199474548.

The previous prime is 202031983. The next prime is 202032011. The reversal of 202031993 is 399130202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 399130202 = 2 ⋅199565101.

It is a cyclic number.

It is not a de Polignac number, because 202031993 - 2¹² = 202027897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (202031923) 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, 1278605 + ... + 1278762.

It is an arithmetic number, because the mean of its divisors is an integer number (51147360).

Almost surely, 2^202031993 is an apocalyptic number.

It is an amenable number.

202031993 is a deficient number, since it is larger than the sum of its proper divisors (2557447).

202031993 is an equidigital number, since it uses as much as digits as its factorization.

202031993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557446.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 202031993 is about 14213.7958688030. The cubic root of 202031993 is about 586.7774057413. Note that the first 3 decimals are identical.

The spelling of 202031993 in words is "two hundred two million, thirty-one thousand, nine hundred ninety-three".