9487447861 has 2 divisors, whose sum is σ = 9487447862. Its totient is φ = 9487447860.

The previous prime is 9487447843. The next prime is 9487447891. The reversal of 9487447861 is 1687447849.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6809385361 + 2678062500 = 82519^2 + 51750^2 .

It is a cyclic number.

It is not a de Polignac number, because 9487447861 - 2⁵ = 9487447829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9487447796 and 9487447805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9487447811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4743723930 + 4743723931.

It is an arithmetic number, because the mean of its divisors is an integer number (4743723931).

Almost surely, 2^9487447861 is an apocalyptic number.

It is an amenable number.

9487447861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9487447861 is an equidigital number, since it uses as much as digits as its factorization.

9487447861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 58.

The square root of 9487447861 is about 97403.5310499573. The cubic root of 9487447861 is about 2116.9785977333.

The spelling of 9487447861 in words is "nine billion, four hundred eighty-seven million, four hundred forty-seven thousand, eight hundred sixty-one".