7312799981 has 2 divisors, whose sum is σ = 7312799982. Its totient is φ = 7312799980.

The previous prime is 7312799939. The next prime is 7312800043. The reversal of 7312799981 is 1899972137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5792579881 + 1520220100 = 76109^2 + 38990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7312799981 is a prime.

It is a super-2 number, since 2×7312799981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7312790981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3656399990 + 3656399991.

It is an arithmetic number, because the mean of its divisors is an integer number (3656399991).

Almost surely, 2^7312799981 is an apocalyptic number.

It is an amenable number.

7312799981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7312799981 is an equidigital number, since it uses as much as digits as its factorization.

7312799981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 7312799981 is about 85514.9108693917. The cubic root of 7312799981 is about 1941.0105604913.

The spelling of 7312799981 in words is "seven billion, three hundred twelve million, seven hundred ninety-nine thousand, nine hundred eighty-one".