61685071 has 12 divisors (see below), whose sum is σ = 74072640. Its totient is φ = 51166080.

The previous prime is 61685051. The next prime is 61685081. The reversal of 61685071 is 17058616.

It is not a de Polignac number, because 61685071 - 2¹⁹ = 61160783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61685051) 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 in 11 ways as a sum of consecutive naturals, for example, 18786 + ... + 21823.

It is an arithmetic number, because the mean of its divisors is an integer number (6172720).

Almost surely, 2^61685071 is an apocalyptic number.

61685071 is the 4535-th hex number.

61685071 is a deficient number, since it is larger than the sum of its proper divisors (12387569).

61685071 is a wasteful number, since it uses less digits than its factorization.

61685071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40654 (or 40647 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 61685071 is about 7853.9844028366. The cubic root of 61685071 is about 395.1178860872.

The spelling of 61685071 in words is "sixty-one million, six hundred eighty-five thousand, seventy-one".