31581361351 has 2 divisors, whose sum is σ = 31581361352. Its totient is φ = 31581361350.

The previous prime is 31581361337. The next prime is 31581361417. The reversal of 31581361351 is 15316318513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31581361351 - 2¹⁷ = 31581230279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31581361351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31581361151) 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, 15790680675 + 15790680676.

It is an arithmetic number, because the mean of its divisors is an integer number (15790680676).

Almost surely, 2^31581361351 is an apocalyptic number.

31581361351 is a deficient number, since it is larger than the sum of its proper divisors (1).

31581361351 is an equidigital number, since it uses as much as digits as its factorization.

31581361351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

Adding to 31581361351 its reverse (15316318513), we get a palindrome (46897679864).

The spelling of 31581361351 in words is "thirty-one billion, five hundred eighty-one million, three hundred sixty-one thousand, three hundred fifty-one".