31302620317 has 2 divisors, whose sum is σ = 31302620318. Its totient is φ = 31302620316.

The previous prime is 31302620309. The next prime is 31302620341. The reversal of 31302620317 is 71302620313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22119423076 + 9183197241 = 148726^2 + 95829^2 .

It is an emirp because it is prime and its reverse (71302620313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31302620317 - 2³ = 31302620309 is a prime.

It is a super-2 number, since 2×31302620317² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31302620117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15651310158 + 15651310159.

It is an arithmetic number, because the mean of its divisors is an integer number (15651310159).

Almost surely, 2^31302620317 is an apocalyptic number.

It is an amenable number.

31302620317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31302620317 is an equidigital number, since it uses as much as digits as its factorization.

31302620317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The spelling of 31302620317 in words is "thirty-one billion, three hundred two million, six hundred twenty thousand, three hundred seventeen".