202531993 has 2 divisors, whose sum is σ = 202531994. Its totient is φ = 202531992.

The previous prime is 202531991. The next prime is 202532009. The reversal of 202531993 is 399135202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138579984 + 63952009 = 11772^2 + 7997^2 .

It is a cyclic number.

It is not a de Polignac number, because 202531993 - 2¹ = 202531991 is a prime.

Together with 202531991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (202531991) 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 as a sum of consecutive naturals, namely, 101265996 + 101265997.

It is an arithmetic number, because the mean of its divisors is an integer number (101265997).

Almost surely, 2^202531993 is an apocalyptic number.

It is an amenable number.

202531993 is a deficient number, since it is larger than the sum of its proper divisors (1).

202531993 is an equidigital number, since it uses as much as digits as its factorization.

202531993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 202531993 is about 14231.3735457966. The cubic root of 202531993 is about 587.2610700679.

The spelling of 202531993 in words is "two hundred two million, five hundred thirty-one thousand, nine hundred ninety-three".