9631009561 has 2 divisors, whose sum is σ = 9631009562. Its totient is φ = 9631009560.

The previous prime is 9631009547. The next prime is 9631009571. The reversal of 9631009561 is 1659001369.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8071944336 + 1559065225 = 89844^2 + 39485^2 .

It is a cyclic number.

It is not a de Polignac number, because 9631009561 - 2⁷ = 9631009433 is a prime.

It is not a weakly prime, because it can be changed into another prime (9631009571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4815504780 + 4815504781.

It is an arithmetic number, because the mean of its divisors is an integer number (4815504781).

Almost surely, 2^9631009561 is an apocalyptic number.

It is an amenable number.

9631009561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9631009561 is an equidigital number, since it uses as much as digits as its factorization.

9631009561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 9631009561 is about 98137.7071313570. The cubic root of 9631009561 is about 2127.6030521522.

The spelling of 9631009561 in words is "nine billion, six hundred thirty-one million, nine thousand, five hundred sixty-one".