61686113 has 2 divisors, whose sum is σ = 61686114. Its totient is φ = 61686112.

The previous prime is 61686109. The next prime is 61686127. The reversal of 61686113 is 31168616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59474944 + 2211169 = 7712^2 + 1487^2 .

It is a cyclic number.

It is not a de Polignac number, because 61686113 - 2² = 61686109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61686113.

It is not a weakly prime, because it can be changed into another prime (61686143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30843056 + 30843057.

It is an arithmetic number, because the mean of its divisors is an integer number (30843057).

Almost surely, 2^61686113 is an apocalyptic number.

It is an amenable number.

61686113 is a deficient number, since it is larger than the sum of its proper divisors (1).

61686113 is an equidigital number, since it uses as much as digits as its factorization.

61686113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 61686113 is about 7854.0507383133. The cubic root of 61686113 is about 395.1201108855.

The spelling of 61686113 in words is "sixty-one million, six hundred eighty-six thousand, one hundred thirteen".