61169985 has 40 divisors (see below), whose sum is σ = 111208680. Its totient is φ = 32161536.

The previous prime is 61169981. The next prime is 61169993. The reversal of 61169985 is 58996116.

It can be written as a sum of positive squares in 4 ways, for example, as 1679616 + 59490369 = 1296^2 + 7713^2 .

It is not a de Polignac number, because 61169985 - 2² = 61169981 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 61169985.

It is not an unprimeable number, because it can be changed into a prime (61169981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28531 + ... + 30599.

It is an arithmetic number, because the mean of its divisors is an integer number (2780217).

Almost surely, 2^61169985 is an apocalyptic number.

It is an amenable number.

61169985 is a deficient number, since it is larger than the sum of its proper divisors (50038695).

61169985 is a wasteful number, since it uses less digits than its factorization.

61169985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2150 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61169985 is about 7821.1242797951. The cubic root of 61169985 is about 394.0150324514.

The spelling of 61169985 in words is "sixty-one million, one hundred sixty-nine thousand, nine hundred eighty-five".