31303130321 has 2 divisors, whose sum is σ = 31303130322. Its totient is φ = 31303130320.

The previous prime is 31303130297. The next prime is 31303130333. The reversal of 31303130321 is 12303130313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26935374400 + 4367755921 = 164120^2 + 66089^2 .

It is a cyclic number.

It is not a de Polignac number, because 31303130321 - 2²² = 31298936017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31303130293 and 31303130302.

It is not a weakly prime, because it can be changed into another prime (31303130351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15651565160 + 15651565161.

It is an arithmetic number, because the mean of its divisors is an integer number (15651565161).

Almost surely, 2^31303130321 is an apocalyptic number.

It is an amenable number.

31303130321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31303130321 is an equidigital number, since it uses as much as digits as its factorization.

31303130321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 31303130321 its reverse (12303130313), we get a palindrome (43606260634).

The spelling of 31303130321 in words is "thirty-one billion, three hundred three million, one hundred thirty thousand, three hundred twenty-one".