61159165 has 4 divisors (see below), whose sum is σ = 73391004. Its totient is φ = 48927328.

The previous prime is 61159121. The next prime is 61159169. The reversal of 61159165 is 56195116.

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 35545444 + 25613721 = 5962^2 + 5061^2 .

It is a cyclic number.

It is not a de Polignac number, because 61159165 - 2⁷ = 61159037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61159165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61159169) 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, 6115912 + ... + 6115921.

It is an arithmetic number, because the mean of its divisors is an integer number (18347751).

Almost surely, 2^61159165 is an apocalyptic number.

It is an amenable number.

61159165 is a deficient number, since it is larger than the sum of its proper divisors (12231839).

61159165 is a wasteful number, since it uses less digits than its factorization.

61159165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231838.

The product of its digits is 8100, while the sum is 34.

The square root of 61159165 is about 7820.4325327951. The cubic root of 61159165 is about 393.9917994119.

The spelling of 61159165 in words is "sixty-one million, one hundred fifty-nine thousand, one hundred sixty-five".