1312303981 has 2 divisors, whose sum is σ = 1312303982. Its totient is φ = 1312303980.

The previous prime is 1312303963. The next prime is 1312303999. The reversal of 1312303981 is 1893032131.

It is a balanced prime because it is at equal distance from previous prime (1312303963) and next prime (1312303999).

It can be written as a sum of positive squares in only one way, i.e., 990675625 + 321628356 = 31475^2 + 17934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312303981 - 2¹¹ = 1312301933 is a prime.

It is a super-2 number, since 2×1312303981² = 3444283477096896722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312303921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656151990 + 656151991.

It is an arithmetic number, because the mean of its divisors is an integer number (656151991).

Almost surely, 2^1312303981 is an apocalyptic number.

It is an amenable number.

1312303981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312303981 is an equidigital number, since it uses as much as digits as its factorization.

1312303981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1312303981 is about 36225.7364452401. The cubic root of 1312303981 is about 1094.8252762924.

The spelling of 1312303981 in words is "one billion, three hundred twelve million, three hundred three thousand, nine hundred eighty-one".