61985711 has 4 divisors (see below), whose sum is σ = 62003424. Its totient is φ = 61968000.

The previous prime is 61985659. The next prime is 61985719. The reversal of 61985711 is 11758916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61985711 - 2¹⁸ = 61723567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61985719) 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 3 ways as a sum of consecutive naturals, for example, 1655 + ... + 11256.

It is an arithmetic number, because the mean of its divisors is an integer number (15500856).

Almost surely, 2^61985711 is an apocalyptic number.

61985711 is a deficient number, since it is larger than the sum of its proper divisors (17713).

61985711 is a wasteful number, since it uses less digits than its factorization.

61985711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17712.

The product of its digits is 15120, while the sum is 38.

The square root of 61985711 is about 7873.1004693196. The cubic root of 61985711 is about 395.7587530872.

The spelling of 61985711 in words is "sixty-one million, nine hundred eighty-five thousand, seven hundred eleven".