61918529 has 2 divisors, whose sum is σ = 61918530. Its totient is φ = 61918528.

The previous prime is 61918513. The next prime is 61918531. The reversal of 61918529 is 92581916.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 452929 = 7840^2 + 673^2 .

It is a cyclic number.

It is not a de Polignac number, because 61918529 - 2⁴ = 61918513 is a prime.

It is a Sophie Germain prime.

Together with 61918531, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61918579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30959264 + 30959265.

It is an arithmetic number, because the mean of its divisors is an integer number (30959265).

Almost surely, 2^61918529 is an apocalyptic number.

It is an amenable number.

61918529 is a deficient number, since it is larger than the sum of its proper divisors (1).

61918529 is an equidigital number, since it uses as much as digits as its factorization.

61918529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 61918529 is about 7868.8327596919. The cubic root of 61918529 is about 395.6157229410.

The spelling of 61918529 in words is "sixty-one million, nine hundred eighteen thousand, five hundred twenty-nine".