202111993 has 4 divisors (see below), whose sum is σ = 205537680. Its totient is φ = 198686308.

The previous prime is 202111981. The next prime is 202112003. The reversal of 202111993 is 399111202.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202111993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202151993) 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, 1712755 + ... + 1712872.

It is an arithmetic number, because the mean of its divisors is an integer number (51384420).

Almost surely, 2^202111993 is an apocalyptic number.

It is an amenable number.

202111993 is a deficient number, since it is larger than the sum of its proper divisors (3425687).

202111993 is an equidigital number, since it uses as much as digits as its factorization.

202111993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425686.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 202111993 is about 14216.6097576040. The cubic root of 202111993 is about 586.8548456179.

It can be divided in two parts, 20211199 and 3, that added together give a palindrome (20211202).

The spelling of 202111993 in words is "two hundred two million, one hundred eleven thousand, nine hundred ninety-three".