61135985 has 4 divisors (see below), whose sum is σ = 73363188. Its totient is φ = 48908784.

The previous prime is 61135933. The next prime is 61136003. The reversal of 61135985 is 58953116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6390784 + 54745201 = 2528^2 + 7399^2 .

It is a cyclic number.

It is not a de Polignac number, because 61135985 - 2¹⁰ = 61134961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6113594 + ... + 6113603.

It is an arithmetic number, because the mean of its divisors is an integer number (18340797).

Almost surely, 2^61135985 is an apocalyptic number.

It is an amenable number.

61135985 is a deficient number, since it is larger than the sum of its proper divisors (12227203).

61135985 is a wasteful number, since it uses less digits than its factorization.

61135985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12227202.

The product of its digits is 32400, while the sum is 38.

The square root of 61135985 is about 7818.9503771286. The cubic root of 61135985 is about 393.9420173721.

The spelling of 61135985 in words is "sixty-one million, one hundred thirty-five thousand, nine hundred eighty-five".