7207487981 has 2 divisors, whose sum is σ = 7207487982. Its totient is φ = 7207487980.

The previous prime is 7207487939. The next prime is 7207488053. The reversal of 7207487981 is 1897847027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7021602025 + 185885956 = 83795^2 + 13634^2 .

It is an emirp because it is prime and its reverse (1897847027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7207487981 - 2¹⁴ = 7207471597 is a prime.

It is a super-2 number, since 2×7207487981² (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 (7207487081) 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, 3603743990 + 3603743991.

It is an arithmetic number, because the mean of its divisors is an integer number (3603743991).

Almost surely, 2^7207487981 is an apocalyptic number.

It is an amenable number.

7207487981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7207487981 is an equidigital number, since it uses as much as digits as its factorization.

7207487981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 7207487981 is about 84896.9256274925. The cubic root of 7207487981 is about 1931.6479415605.

The spelling of 7207487981 in words is "seven billion, two hundred seven million, four hundred eighty-seven thousand, nine hundred eighty-one".