55042521 has 4 divisors (see below), whose sum is σ = 73390032. Its totient is φ = 36695012.

The previous prime is 55042513. The next prime is 55042523. The reversal of 55042521 is 12524055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55042521 - 2³ = 55042513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55042491 and 55042500.

It is not an unprimeable number, because it can be changed into a prime (55042523) 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, 9173751 + ... + 9173756.

It is an arithmetic number, because the mean of its divisors is an integer number (18347508).

Almost surely, 2^55042521 is an apocalyptic number.

It is an amenable number.

55042521 is a deficient number, since it is larger than the sum of its proper divisors (18347511).

55042521 is a wasteful number, since it uses less digits than its factorization.

55042521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18347510.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 55042521 is about 7419.0646984644. The cubic root of 55042521 is about 380.3932240686.

Adding to 55042521 its reverse (12524055), we get a palindrome (67566576).

It can be divided in two parts, 550 and 42521, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 55042521 in words is "fifty-five million, forty-two thousand, five hundred twenty-one".