61905543 has 16 divisors (see below), whose sum is σ = 97376256. Its totient is φ = 34233120.

The previous prime is 61905523. The next prime is 61905559. The reversal of 61905543 is 34550916.

It is a happy number.

61905543 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 61905543 - 2⁵ = 61905511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61905523) 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, 46896 + ... + 48197.

It is an arithmetic number, because the mean of its divisors is an integer number (6086016).

Almost surely, 2^61905543 is an apocalyptic number.

61905543 is a deficient number, since it is larger than the sum of its proper divisors (35470713).

61905543 is a wasteful number, since it uses less digits than its factorization.

61905543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95134.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 61905543 is about 7868.0075622739. The cubic root of 61905543 is about 395.5880638807.

The spelling of 61905543 in words is "sixty-one million, nine hundred five thousand, five hundred forty-three".