31012040321 has 2 divisors, whose sum is σ = 31012040322. Its totient is φ = 31012040320.

The previous prime is 31012040309. The next prime is 31012040333. The reversal of 31012040321 is 12304021013.

It is a balanced prime because it is at equal distance from previous prime (31012040309) and next prime (31012040333).

It can be written as a sum of positive squares in only one way, i.e., 28723470400 + 2288569921 = 169480^2 + 47839^2 .

It is an emirp because it is prime and its reverse (12304021013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31012040321 - 2¹⁰ = 31012039297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31012040321.

It is not a weakly prime, because it can be changed into another prime (31012040021) 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, 15506020160 + 15506020161.

It is an arithmetic number, because the mean of its divisors is an integer number (15506020161).

Almost surely, 2^31012040321 is an apocalyptic number.

It is an amenable number.

31012040321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012040321 is an equidigital number, since it uses as much as digits as its factorization.

31012040321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31012040321 its reverse (12304021013), we get a palindrome (43316061334).

The spelling of 31012040321 in words is "thirty-one billion, twelve million, forty thousand, three hundred twenty-one".