61286985 has 24 divisors (see below), whose sum is σ = 109104840. Its totient is φ = 31802112.

The previous prime is 61286983. The next prime is 61287001. The reversal of 61286985 is 58968216.

61286985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13220496 + 48066489 = 3636^2 + 6933^2 .

It is not a de Polignac number, because 61286985 - 2¹ = 61286983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61286985.

It is not an unprimeable number, because it can be changed into a prime (61286983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16740 + ... + 20069.

It is an arithmetic number, because the mean of its divisors is an integer number (4546035).

Almost surely, 2^61286985 is an apocalyptic number.

It is an amenable number.

61286985 is a deficient number, since it is larger than the sum of its proper divisors (47817855).

61286985 is a wasteful number, since it uses less digits than its factorization.

61286985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36857 (or 36854 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 61286985 is about 7828.6004496334. The cubic root of 61286985 is about 394.2660836725.

The spelling of 61286985 in words is "sixty-one million, two hundred eighty-six thousand, nine hundred eighty-five".