61109559 has 20 divisors (see below), whose sum is σ = 104329104. Its totient is φ = 34919424.

The previous prime is 61109539. The next prime is 61109563. The reversal of 61109559 is 95590116.

It is not a de Polignac number, because 61109559 - 2⁷ = 61109431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61109539) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 53322 + ... + 54455.

Almost surely, 2^61109559 is an apocalyptic number.

61109559 is a deficient number, since it is larger than the sum of its proper divisors (43219545).

61109559 is a wasteful number, since it uses less digits than its factorization.

61109559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107796 (or 107787 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 61109559 is about 7817.2603257151. The cubic root of 61109559 is about 393.8852487763.

The spelling of 61109559 in words is "sixty-one million, one hundred nine thousand, five hundred fifty-nine".