203129993 has 4 divisors (see below), whose sum is σ = 221596368. Its totient is φ = 184663620.

The previous prime is 203129989. The next prime is 203129999. The reversal of 203129993 is 399921302.

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 not a de Polignac number, because 203129993 - 2² = 203129989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203129999) 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 in 3 ways as a sum of consecutive naturals, for example, 9233171 + ... + 9233192.

It is an arithmetic number, because the mean of its divisors is an integer number (55399092).

Almost surely, 2^203129993 is an apocalyptic number.

It is an amenable number.

203129993 is a deficient number, since it is larger than the sum of its proper divisors (18466375).

203129993 is a wasteful number, since it uses less digits than its factorization.

203129993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18466374.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 203129993 is about 14252.3679786904. The cubic root of 203129993 is about 587.8384883888.

The spelling of 203129993 in words is "two hundred three million, one hundred twenty-nine thousand, nine hundred ninety-three".