61108661 has 2 divisors, whose sum is σ = 61108662. Its totient is φ = 61108660.

The previous prime is 61108613. The next prime is 61108673. The reversal of 61108661 is 16680116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34586161 + 26522500 = 5881^2 + 5150^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 19980119 and 91108991.

It is a cyclic number.

It is not a de Polignac number, because 61108661 - 2¹⁸ = 60846517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61108261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554330 + 30554331.

It is an arithmetic number, because the mean of its divisors is an integer number (30554331).

Almost surely, 2^61108661 is an apocalyptic number.

It is an amenable number.

61108661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61108661 is an equidigital number, since it uses as much as digits as its factorization.

61108661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61108661 is about 7817.2028885017. The cubic root of 61108661 is about 393.8833193963.

Adding to 61108661 its reverse (16680116), we get a palindrome (77788777).

The spelling of 61108661 in words is "sixty-one million, one hundred eight thousand, six hundred sixty-one".