61809041 has 18 divisors (see below), whose sum is σ = 73249218. Its totient is φ = 52002720.

The previous prime is 61809031. The next prime is 61809053. The reversal of 61809041 is 14090816.

61809041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 56310016 + 5499025 = 7504^2 + 2345^2 .

It is not a de Polignac number, because 61809041 - 2²² = 57614737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61808995 and 61809013.

It is not an unprimeable number, because it can be changed into a prime (61809031) 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 17 ways as a sum of consecutive naturals, for example, 219821 + ... + 220101.

It is an arithmetic number, because the mean of its divisors is an integer number (4069401).

Almost surely, 2^61809041 is an apocalyptic number.

It is an amenable number.

61809041 is a deficient number, since it is larger than the sum of its proper divisors (11440177).

61809041 is an equidigital number, since it uses as much as digits as its factorization.

61809041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61809041 is about 7861.8726140787. The cubic root of 61809041 is about 395.3824016671.

Adding to 61809041 its reverse (14090816), we get a palindrome (75899857).

The spelling of 61809041 in words is "sixty-one million, eight hundred nine thousand, forty-one".