31320213097 has 2 divisors, whose sum is σ = 31320213098. Its totient is φ = 31320213096.

The previous prime is 31320213091. The next prime is 31320213157. The reversal of 31320213097 is 79031202313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29803188496 + 1517024601 = 172636^2 + 38949^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320213097 - 2⁷ = 31320212969 is a prime.

It is not a weakly prime, because it can be changed into another prime (31320213091) 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, 15660106548 + 15660106549.

It is an arithmetic number, because the mean of its divisors is an integer number (15660106549).

Almost surely, 2^31320213097 is an apocalyptic number.

It is an amenable number.

31320213097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320213097 is an equidigital number, since it uses as much as digits as its factorization.

31320213097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The spelling of 31320213097 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, ninety-seven".