8409937561 has 2 divisors, whose sum is σ = 8409937562. Its totient is φ = 8409937560.

The previous prime is 8409937531. The next prime is 8409937573. The reversal of 8409937561 is 1657399048.

It is a happy number.

8409937561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4256779536 + 4153158025 = 65244^2 + 64445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8409937561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8409937499 and 8409937508.

It is not a weakly prime, because it can be changed into another prime (8409937531) 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, 4204968780 + 4204968781.

It is an arithmetic number, because the mean of its divisors is an integer number (4204968781).

Almost surely, 2^8409937561 is an apocalyptic number.

It is an amenable number.

8409937561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8409937561 is an equidigital number, since it uses as much as digits as its factorization.

8409937561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 8409937561 is about 91705.7117141566. The cubic root of 8409937561 is about 2033.5940247649.

The spelling of 8409937561 in words is "eight billion, four hundred nine million, nine hundred thirty-seven thousand, five hundred sixty-one".