61549543 has 4 divisors (see below), whose sum is σ = 67144968. Its totient is φ = 55954120.

The previous prime is 61549519. The next prime is 61549591. The reversal of 61549543 is 34594516.

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 61549543 - 2¹³ = 61541351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61549643) 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, 2797696 + ... + 2797717.

It is an arithmetic number, because the mean of its divisors is an integer number (16786242).

Almost surely, 2^61549543 is an apocalyptic number.

61549543 is a deficient number, since it is larger than the sum of its proper divisors (5595425).

61549543 is a wasteful number, since it uses less digits than its factorization.

61549543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5595424.

The product of its digits is 64800, while the sum is 37.

The square root of 61549543 is about 7845.3516810912. The cubic root of 61549543 is about 394.8283033094.

The spelling of 61549543 in words is "sixty-one million, five hundred forty-nine thousand, five hundred forty-three".