31000201231 has 2 divisors, whose sum is σ = 31000201232. Its totient is φ = 31000201230.

The previous prime is 31000201213. The next prime is 31000201237. The reversal of 31000201231 is 13210200013.

Together with previous prime (31000201213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31000201231 is a prime.

It is a super-2 number, since 2×31000201231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31000201237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500100615 + 15500100616.

It is an arithmetic number, because the mean of its divisors is an integer number (15500100616).

Almost surely, 2^31000201231 is an apocalyptic number.

31000201231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000201231 is an equidigital number, since it uses as much as digits as its factorization.

31000201231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31000201231 its reverse (13210200013), we get a palindrome (44210401244).

The spelling of 31000201231 in words is "thirty-one billion, two hundred one thousand, two hundred thirty-one".