31321030309 has 2 divisors, whose sum is σ = 31321030310. Its totient is φ = 31321030308.

The previous prime is 31321030291. The next prime is 31321030343. The reversal of 31321030309 is 90303012313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20150654209 + 11170376100 = 141953^2 + 105690^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321030309 - 2⁵ = 31321030277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321030409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660515154 + 15660515155.

It is an arithmetic number, because the mean of its divisors is an integer number (15660515155).

Almost surely, 2^31321030309 is an apocalyptic number.

It is an amenable number.

31321030309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321030309 is an equidigital number, since it uses as much as digits as its factorization.

31321030309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 25.

The spelling of 31321030309 in words is "thirty-one billion, three hundred twenty-one million, thirty thousand, three hundred nine".