61216601 has 2 divisors, whose sum is σ = 61216602. Its totient is φ = 61216600.

The previous prime is 61216591. The next prime is 61216619. The reversal of 61216601 is 10661216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 10465225 = 7124^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 61216601 - 2¹⁰ = 61215577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61216681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30608300 + 30608301.

It is an arithmetic number, because the mean of its divisors is an integer number (30608301).

Almost surely, 2^61216601 is an apocalyptic number.

It is an amenable number.

61216601 is a deficient number, since it is larger than the sum of its proper divisors (1).

61216601 is an equidigital number, since it uses as much as digits as its factorization.

61216601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 61216601 is about 7824.1038464478. The cubic root of 61216601 is about 394.1150964559.

Adding to 61216601 its reverse (10661216), we get a palindrome (71877817).

The spelling of 61216601 in words is "sixty-one million, two hundred sixteen thousand, six hundred one".