61611109 has 16 divisors (see below), whose sum is σ = 73221120. Its totient is φ = 50722560.

The previous prime is 61611101. The next prime is 61611113. The reversal of 61611109 is 90111616.

61611109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61611109 - 2³ = 61611101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611101) 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 15 ways as a sum of consecutive naturals, for example, 44589 + ... + 45949.

It is an arithmetic number, because the mean of its divisors is an integer number (4576320).

Almost surely, 2^61611109 is an apocalyptic number.

It is an amenable number.

61611109 is a deficient number, since it is larger than the sum of its proper divisors (11610011).

61611109 is a wasteful number, since it uses less digits than its factorization.

61611109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 61611109 is about 7849.2744250663. The cubic root of 61611109 is about 394.9599040644.

The spelling of 61611109 in words is "sixty-one million, six hundred eleven thousand, one hundred nine".