61918513 has 2 divisors, whose sum is σ = 61918514. Its totient is φ = 61918512.

The previous prime is 61918499. The next prime is 61918529. The reversal of 61918513 is 31581916.

61918513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721569 + 3196944 = 7663^2 + 1788^2 .

It is a cyclic number.

It is not a de Polignac number, because 61918513 - 2⁵ = 61918481 is a prime.

It is not a weakly prime, because it can be changed into another prime (61918013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30959256 + 30959257.

It is an arithmetic number, because the mean of its divisors is an integer number (30959257).

Almost surely, 2^61918513 is an apocalyptic number.

It is an amenable number.

61918513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61918513 is an equidigital number, since it uses as much as digits as its factorization.

61918513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 61918513 is about 7868.8317430226. The cubic root of 61918513 is about 395.6156888647.

The spelling of 61918513 in words is "sixty-one million, nine hundred eighteen thousand, five hundred thirteen".