203131013 has 4 divisors (see below), whose sum is σ = 203330988. Its totient is φ = 202931040.

The previous prime is 203130979. The next prime is 203131043. The reversal of 203131013 is 310131302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161747524 + 41383489 = 12718^2 + 6433^2 .

It is a cyclic number.

It is not a de Polignac number, because 203131013 - 2¹⁰ = 203129989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131043) 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, 98456 + ... + 100497.

It is an arithmetic number, because the mean of its divisors is an integer number (50832747).

Almost surely, 2^203131013 is an apocalyptic number.

It is an amenable number.

203131013 is a deficient number, since it is larger than the sum of its proper divisors (199975).

203131013 is a wasteful number, since it uses less digits than its factorization.

203131013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199974.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 203131013 is about 14252.4037621729. The cubic root of 203131013 is about 587.8394723142.

Adding to 203131013 its reverse (310131302), we get a palindrome (513262315).

The spelling of 203131013 in words is "two hundred three million, one hundred thirty-one thousand, thirteen".