10312319981 has 2 divisors, whose sum is σ = 10312319982. Its totient is φ = 10312319980.

The previous prime is 10312319957. The next prime is 10312320049. The reversal of 10312319981 is 18991321301.

10312319981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9025950025 + 1286369956 = 95005^2 + 35866^2 .

It is a cyclic number.

It is not a de Polignac number, because 10312319981 - 2²² = 10308125677 is a prime.

It is a super-2 number, since 2×10312319981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10312319081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5156159990 + 5156159991.

It is an arithmetic number, because the mean of its divisors is an integer number (5156159991).

Almost surely, 2^10312319981 is an apocalyptic number.

It is an amenable number.

10312319981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10312319981 is an equidigital number, since it uses as much as digits as its factorization.

10312319981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 10312319981 in words is "ten billion, three hundred twelve million, three hundred nineteen thousand, nine hundred eighty-one".