61536543 has 4 divisors (see below), whose sum is σ = 82048728. Its totient is φ = 41024360.

The previous prime is 61536511. The next prime is 61536547. The reversal of 61536543 is 34563516.

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 61536543 - 2⁵ = 61536511 is a prime.

It is a super-2 number, since 2×61536543² = 7573492248781698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61536547) 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, 10256088 + ... + 10256093.

It is an arithmetic number, because the mean of its divisors is an integer number (20512182).

Almost surely, 2^61536543 is an apocalyptic number.

61536543 is a deficient number, since it is larger than the sum of its proper divisors (20512185).

61536543 is a wasteful number, since it uses less digits than its factorization.

61536543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20512184.

The product of its digits is 32400, while the sum is 33.

The square root of 61536543 is about 7844.5231212611. The cubic root of 61536543 is about 394.8005038647.

The spelling of 61536543 in words is "sixty-one million, five hundred thirty-six thousand, five hundred forty-three".