61018543 has 4 divisors (see below), whose sum is σ = 61062160. Its totient is φ = 60974928.

The previous prime is 61018501. The next prime is 61018553. The reversal of 61018543 is 34581016.

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 61018543 - 2²⁵ = 27464111 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61018553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19638 + ... + 22531.

It is an arithmetic number, because the mean of its divisors is an integer number (15265540).

Almost surely, 2^61018543 is an apocalyptic number.

61018543 is a deficient number, since it is larger than the sum of its proper divisors (43617).

61018543 is a wasteful number, since it uses less digits than its factorization.

61018543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43616.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 61018543 is about 7811.4366796384. The cubic root of 61018543 is about 393.6896019562.

Adding to 61018543 its reverse (34581016), we get a palindrome (95599559).

The spelling of 61018543 in words is "sixty-one million, eighteen thousand, five hundred forty-three".