203031312131 has 2 divisors, whose sum is σ = 203031312132. Its totient is φ = 203031312130.

The previous prime is 203031312047. The next prime is 203031312139. The reversal of 203031312131 is 131213130302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203031312131 is a prime.

It is a super-2 number, since 2×203031312131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203031312139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101515656065 + 101515656066.

It is an arithmetic number, because the mean of its divisors is an integer number (101515656066).

Almost surely, 2^203031312131 is an apocalyptic number.

203031312131 is a deficient number, since it is larger than the sum of its proper divisors (1).

203031312131 is an equidigital number, since it uses as much as digits as its factorization.

203031312131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 203031312131 its reverse (131213130302), we get a palindrome (334244442433).

The spelling of 203031312131 in words is "two hundred three billion, thirty-one million, three hundred twelve thousand, one hundred thirty-one".