61418561 has 2 divisors, whose sum is σ = 61418562. Its totient is φ = 61418560.

The previous prime is 61418537. The next prime is 61418611. The reversal of 61418561 is 16581416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34586161 + 26832400 = 5881^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 61418561 - 2¹⁰ = 61417537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61411561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30709280 + 30709281.

It is an arithmetic number, because the mean of its divisors is an integer number (30709281).

Almost surely, 2^61418561 is an apocalyptic number.

It is an amenable number.

61418561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61418561 is an equidigital number, since it uses as much as digits as its factorization.

61418561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 61418561 is about 7836.9994896006. Note that the first 3 decimals coincide. The cubic root of 61418561 is about 394.5480297473.

Adding to 61418561 its reverse (16581416), we get a palindrome (77999977).

The spelling of 61418561 in words is "sixty-one million, four hundred eighteen thousand, five hundred sixty-one".