31405205113 has 2 divisors, whose sum is σ = 31405205114. Its totient is φ = 31405205112.

The previous prime is 31405205107. The next prime is 31405205159. The reversal of 31405205113 is 31150250413.

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., 29337866089 + 2067339024 = 171283^2 + 45468^2 .

It is a cyclic number.

It is not a de Polignac number, because 31405205113 - 2⁵ = 31405205081 is a prime.

It is not a weakly prime, because it can be changed into another prime (31405202113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702602556 + 15702602557.

It is an arithmetic number, because the mean of its divisors is an integer number (15702602557).

Almost surely, 2^31405205113 is an apocalyptic number.

It is an amenable number.

31405205113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405205113 is an equidigital number, since it uses as much as digits as its factorization.

31405205113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 31405205113 its reverse (31150250413), we get a palindrome (62555455526).

The spelling of 31405205113 in words is "thirty-one billion, four hundred five million, two hundred five thousand, one hundred thirteen".