61321717 has 2 divisors, whose sum is σ = 61321718. Its totient is φ = 61321716.

The previous prime is 61321661. The next prime is 61321763. The reversal of 61321717 is 71712316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58844241 + 2477476 = 7671^2 + 1574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61321717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61321517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30660858 + 30660859.

It is an arithmetic number, because the mean of its divisors is an integer number (30660859).

Almost surely, 2^61321717 is an apocalyptic number.

It is an amenable number.

61321717 is a deficient number, since it is larger than the sum of its proper divisors (1).

61321717 is an equidigital number, since it uses as much as digits as its factorization.

61321717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 61321717 is about 7830.8184118903. The cubic root of 61321717 is about 394.3405478982.

The spelling of 61321717 in words is "sixty-one million, three hundred twenty-one thousand, seven hundred seventeen".