9261047821 has 2 divisors, whose sum is σ = 9261047822. Its totient is φ = 9261047820.

The previous prime is 9261047801. The next prime is 9261047827. The reversal of 9261047821 is 1287401629.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8181202500 + 1079845321 = 90450^2 + 32861^2 .

It is a cyclic number.

It is not a de Polignac number, because 9261047821 - 2⁹ = 9261047309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9261047827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4630523910 + 4630523911.

It is an arithmetic number, because the mean of its divisors is an integer number (4630523911).

Almost surely, 2^9261047821 is an apocalyptic number.

It is an amenable number.

9261047821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9261047821 is an equidigital number, since it uses as much as digits as its factorization.

9261047821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 9261047821 is about 96234.3380556026. The cubic root of 9261047821 is about 2100.0036145818.

The spelling of 9261047821 in words is "nine billion, two hundred sixty-one million, forty-seven thousand, eight hundred twenty-one".