61535543 has 4 divisors (see below), whose sum is σ = 61560480. Its totient is φ = 61510608.

The previous prime is 61535531. The next prime is 61535609. The reversal of 61535543 is 34553516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61535543 - 2⁶ = 61535479 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 (61535503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8303 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (15390120).

Almost surely, 2^61535543 is an apocalyptic number.

61535543 is a deficient number, since it is larger than the sum of its proper divisors (24937).

61535543 is a wasteful number, since it uses less digits than its factorization.

61535543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24936.

The product of its digits is 27000, while the sum is 32.

The square root of 61535543 is about 7844.4593822647. The cubic root of 61535543 is about 394.7983652837.

The spelling of 61535543 in words is "sixty-one million, five hundred thirty-five thousand, five hundred forty-three".