31864248109 has 2 divisors, whose sum is σ = 31864248110. Its totient is φ = 31864248108.

The previous prime is 31864248107. The next prime is 31864248151. The reversal of 31864248109 is 90184246813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29729346084 + 2134902025 = 172422^2 + 46205^2 .

It is a cyclic number.

It is not a de Polignac number, because 31864248109 - 2¹ = 31864248107 is a prime.

Together with 31864248107, 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 (31864248107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15932124054 + 15932124055.

It is an arithmetic number, because the mean of its divisors is an integer number (15932124055).

Almost surely, 2^31864248109 is an apocalyptic number.

It is an amenable number.

31864248109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31864248109 is an equidigital number, since it uses as much as digits as its factorization.

31864248109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 31864248109 in words is "thirty-one billion, eight hundred sixty-four million, two hundred forty-eight thousand, one hundred nine".