61543109 has 8 divisors (see below), whose sum is σ = 65220000. Its totient is φ = 57910032.

The previous prime is 61543103. The next prime is 61543127. The reversal of 61543109 is 90134516.

61543109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61543109 - 2⁴ = 61543093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61543103) 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 7 ways as a sum of consecutive naturals, for example, 8039 + ... + 13700.

It is an arithmetic number, because the mean of its divisors is an integer number (8152500).

Almost surely, 2^61543109 is an apocalyptic number.

It is an amenable number.

61543109 is a deficient number, since it is larger than the sum of its proper divisors (3676891).

61543109 is a wasteful number, since it uses less digits than its factorization.

61543109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21907.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 61543109 is about 7844.9416186483. The cubic root of 61543109 is about 394.8145452120.

The spelling of 61543109 in words is "sixty-one million, five hundred forty-three thousand, one hundred nine".