61409109 has 16 divisors (see below), whose sum is σ = 85059584. Its totient is φ = 39366000.

The previous prime is 61409093. The next prime is 61409113. The reversal of 61409109 is 90190416.

61409109 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 61409109 - 2⁴ = 61409093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61409129) 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, 13134 + ... + 17184.

It is an arithmetic number, because the mean of its divisors is an integer number (5316224).

Almost surely, 2^61409109 is an apocalyptic number.

It is an amenable number.

61409109 is a deficient number, since it is larger than the sum of its proper divisors (23650475).

61409109 is a wasteful number, since it uses less digits than its factorization.

61409109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 61409109 is about 7836.3964294821. The cubic root of 61409109 is about 394.5277890728.

The spelling of 61409109 in words is "sixty-one million, four hundred nine thousand, one hundred nine".