31320720307 has 2 divisors, whose sum is σ = 31320720308. Its totient is φ = 31320720306.

The previous prime is 31320720283. The next prime is 31320720313. The reversal of 31320720307 is 70302702313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31320720307 - 2¹⁵ = 31320687539 is a prime.

It is not a weakly prime, because it can be changed into another prime (31320720337) 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, 15660360153 + 15660360154.

It is an arithmetic number, because the mean of its divisors is an integer number (15660360154).

Almost surely, 2^31320720307 is an apocalyptic number.

31320720307 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320720307 is an equidigital number, since it uses as much as digits as its factorization.

31320720307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 28.

The spelling of 31320720307 in words is "thirty-one billion, three hundred twenty million, seven hundred twenty thousand, three hundred seven".