61123543 has 4 divisors (see below), whose sum is σ = 65825368. Its totient is φ = 56421720.

The previous prime is 61123541. The next prime is 61123549. The reversal of 61123543 is 34532116.

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 61123543 - 2¹ = 61123541 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 (61123541) 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, 2350893 + ... + 2350918.

It is an arithmetic number, because the mean of its divisors is an integer number (16456342).

Almost surely, 2^61123543 is an apocalyptic number.

61123543 is a deficient number, since it is larger than the sum of its proper divisors (4701825).

61123543 is a wasteful number, since it uses less digits than its factorization.

61123543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701824.

The product of its digits is 2160, while the sum is 25.

The square root of 61123543 is about 7818.1547055555. The cubic root of 61123543 is about 393.9152913824.

Adding to 61123543 its reverse (34532116), we get a palindrome (95655659).

The spelling of 61123543 in words is "sixty-one million, one hundred twenty-three thousand, five hundred forty-three".