61686313 has 8 divisors (see below), whose sum is σ = 66956288. Its totient is φ = 56491344.

The previous prime is 61686301. The next prime is 61686323. The reversal of 61686313 is 31368616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61686313 - 2⁹ = 61685801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61686323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17031 + ... + 20332.

It is an arithmetic number, because the mean of its divisors is an integer number (8369536).

Almost surely, 2^61686313 is an apocalyptic number.

It is an amenable number.

61686313 is a deficient number, since it is larger than the sum of its proper divisors (5269975).

61686313 is a wasteful number, since it uses less digits than its factorization.

61686313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37503.

The product of its digits is 15552, while the sum is 34.

The square root of 61686313 is about 7854.0634705864. The cubic root of 61686313 is about 395.1205379072.

The spelling of 61686313 in words is "sixty-one million, six hundred eighty-six thousand, three hundred thirteen".