31313442109 has 2 divisors, whose sum is σ = 31313442110. Its totient is φ = 31313442108.

The previous prime is 31313442107. The next prime is 31313442163. The reversal of 31313442109 is 90124431313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27141574009 + 4171868100 = 164747^2 + 64590^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313442109 - 2¹ = 31313442107 is a prime.

Together with 31313442107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31313442101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656721054 + 15656721055.

It is an arithmetic number, because the mean of its divisors is an integer number (15656721055).

Almost surely, 2^31313442109 is an apocalyptic number.

It is an amenable number.

31313442109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313442109 is an equidigital number, since it uses as much as digits as its factorization.

31313442109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 31313442109 in words is "thirty-one billion, three hundred thirteen million, four hundred forty-two thousand, one hundred nine".