975565561 has 2 divisors, whose sum is σ = 975565562. Its totient is φ = 975565560.

The previous prime is 975565559. The next prime is 975565601. The reversal of 975565561 is 165565579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915425536 + 60140025 = 30256^2 + 7755^2 .

It is an emirp because it is prime and its reverse (165565579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 975565561 - 2¹ = 975565559 is a prime.

Together with 975565559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (975565361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487782780 + 487782781.

It is an arithmetic number, because the mean of its divisors is an integer number (487782781).

Almost surely, 2^975565561 is an apocalyptic number.

It is an amenable number.

975565561 is a deficient number, since it is larger than the sum of its proper divisors (1).

975565561 is an equidigital number, since it uses as much as digits as its factorization.

975565561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417500, while the sum is 49.

The square root of 975565561 is about 31234.0449029581. The cubic root of 975565561 is about 991.7879335668.

The spelling of 975565561 in words is "nine hundred seventy-five million, five hundred sixty-five thousand, five hundred sixty-one".