9861505441 has 2 divisors, whose sum is σ = 9861505442. Its totient is φ = 9861505440.

The previous prime is 9861505421. The next prime is 9861505481. The reversal of 9861505441 is 1445051689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9440065600 + 421439841 = 97160^2 + 20529^2 .

It is a cyclic number.

It is not a de Polignac number, because 9861505441 - 2²⁵ = 9827951009 is a prime.

It is not a weakly prime, because it can be changed into another prime (9861505421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4930752720 + 4930752721.

It is an arithmetic number, because the mean of its divisors is an integer number (4930752721).

Almost surely, 2^9861505441 is an apocalyptic number.

It is an amenable number.

9861505441 is a deficient number, since it is larger than the sum of its proper divisors (1).

9861505441 is an equidigital number, since it uses as much as digits as its factorization.

9861505441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 9861505441 is about 99305.1128643435. The cubic root of 9861505441 is about 2144.4425022070.

The spelling of 9861505441 in words is "nine billion, eight hundred sixty-one million, five hundred five thousand, four hundred forty-one".