31513320203 has 2 divisors, whose sum is σ = 31513320204. Its totient is φ = 31513320202.

The previous prime is 31513320193. The next prime is 31513320229. The reversal of 31513320203 is 30202331513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31513320203 - 2¹⁰ = 31513319179 is a prime.

It is a super-2 number, since 2×31513320203² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31513320233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15756660101 + 15756660102.

It is an arithmetic number, because the mean of its divisors is an integer number (15756660102).

Almost surely, 2^31513320203 is an apocalyptic number.

31513320203 is a deficient number, since it is larger than the sum of its proper divisors (1).

31513320203 is an equidigital number, since it uses as much as digits as its factorization.

31513320203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 31513320203 its reverse (30202331513), we get a palindrome (61715651716).

The spelling of 31513320203 in words is "thirty-one billion, five hundred thirteen million, three hundred twenty thousand, two hundred three".