31030031231 has 2 divisors, whose sum is σ = 31030031232. Its totient is φ = 31030031230.

The previous prime is 31030031191. The next prime is 31030031237. The reversal of 31030031231 is 13213003013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31030031231 is a prime.

It is a super-2 number, since 2×31030031231² (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 (31030031237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515015615 + 15515015616.

It is an arithmetic number, because the mean of its divisors is an integer number (15515015616).

Almost surely, 2^31030031231 is an apocalyptic number.

31030031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030031231 is an equidigital number, since it uses as much as digits as its factorization.

31030031231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31030031231 its reverse (13213003013), we get a palindrome (44243034244).

The spelling of 31030031231 in words is "thirty-one billion, thirty million, thirty-one thousand, two hundred thirty-one".