55121543 has 4 divisors (see below), whose sum is σ = 55301400. Its totient is φ = 54941688.

The previous prime is 55121533. The next prime is 55121551. The reversal of 55121543 is 34512155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34512155 = 5 ⋅6902431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55121543 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 (55121533) 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, 89468 + ... + 90081.

It is an arithmetic number, because the mean of its divisors is an integer number (13825350).

Almost surely, 2^55121543 is an apocalyptic number.

55121543 is a deficient number, since it is larger than the sum of its proper divisors (179857).

55121543 is a wasteful number, since it uses less digits than its factorization.

55121543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179856.

The product of its digits is 3000, while the sum is 26.

The square root of 55121543 is about 7424.3883923189. The cubic root of 55121543 is about 380.5751746726.

Adding to 55121543 its reverse (34512155), we get a palindrome (89633698).

The spelling of 55121543 in words is "fifty-five million, one hundred twenty-one thousand, five hundred forty-three".